The name of this superfamily has been modified since the most recent official CATH+ release (v4_2_0). At the point of the last release, this superfamily was named:

"
Pleckstrin-homology domain (PH domain)/Phosphotyrosine-binding domain (PTB)
".

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
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FunFam 21977: Beta-adrenergic receptor kinase 1

Please note: GO annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

There are 18 GO terms relating to "molecular function"

The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.
GO Term Annotations Evidence
G-protein coupled receptor kinase activity GO:0004703
Catalysis of the reaction: ATP + G-protein coupled receptor = ADP + G-protein coupled receptor phosphate.
5 P21146 (/IDA) P26817 (/IDA) P26819 (/IDA) Q3UYH7 (/IDA) Q99MK8 (/IDA)
Protein binding GO:0005515
Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
4 P21146 (/IPI) P25098 (/IPI) P26817 (/IPI) Q99MK8 (/IPI)
Protein kinase activity GO:0004672
Catalysis of the phosphorylation of an amino acid residue in a protein, usually according to the reaction: a protein + ATP = a phosphoprotein + ADP.
2 P21146 (/IDA) Q99MK8 (/IDA)
Protein kinase activity GO:0004672
Catalysis of the phosphorylation of an amino acid residue in a protein, usually according to the reaction: a protein + ATP = a phosphoprotein + ADP.
2 B5LZ08 (/IGI) Q801U1 (/IGI)
Edg-2 lysophosphatidic acid receptor binding GO:0031755
Interacting selectively and non-covalently with an Edg-2 lysophosphatidic acid receptor.
2 O97627 (/ISS) P21146 (/ISS)
Beta-adrenergic receptor kinase activity GO:0047696
Catalysis of the reaction: ATP + beta-adrenergic receptor = ADP + phospho-beta-adrenergic receptor.
2 P26817 (/IDA) P26819 (/IDA)
Beta-adrenergic receptor kinase activity GO:0047696
Catalysis of the reaction: ATP + beta-adrenergic receptor = ADP + phospho-beta-adrenergic receptor.
2 P25098 (/TAS) P35626 (/TAS)
Protein kinase activity GO:0004672
Catalysis of the phosphorylation of an amino acid residue in a protein, usually according to the reaction: a protein + ATP = a phosphoprotein + ADP.
1 P25098 (/ISS)
Protein kinase activity GO:0004672
Catalysis of the phosphorylation of an amino acid residue in a protein, usually according to the reaction: a protein + ATP = a phosphoprotein + ADP.
1 P35626 (/TAS)
Protein serine/threonine kinase activity GO:0004674
Catalysis of the reactions: ATP + protein serine = ADP + protein serine phosphate, and ATP + protein threonine = ADP + protein threonine phosphate.
1 Q99MK8 (/IDA)
Protein serine/threonine kinase activity GO:0004674
Catalysis of the reactions: ATP + protein serine = ADP + protein serine phosphate, and ATP + protein threonine = ADP + protein threonine phosphate.
1 P26819 (/TAS)
G-protein coupled receptor kinase activity GO:0004703
Catalysis of the reaction: ATP + G-protein coupled receptor = ADP + G-protein coupled receptor phosphate.
1 Q99MK8 (/IMP)
G-protein coupled receptor kinase activity GO:0004703
Catalysis of the reaction: ATP + G-protein coupled receptor = ADP + G-protein coupled receptor phosphate.
1 P25098 (/ISS)
Alpha-2A adrenergic receptor binding GO:0031694
Interacting selectively and non-covalently with an alpha-2A adrenergic receptor.
1 P21146 (/IPI)
Alpha-2A adrenergic receptor binding GO:0031694
Interacting selectively and non-covalently with an alpha-2A adrenergic receptor.
1 P25098 (/ISS)
D1 dopamine receptor binding GO:0031748
Interacting selectively and non-covalently with a D1 dopamine receptor.
1 P26819 (/IPI)
Edg-2 lysophosphatidic acid receptor binding GO:0031755
Interacting selectively and non-covalently with an Edg-2 lysophosphatidic acid receptor.
1 P25098 (/IDA)
Edg-2 lysophosphatidic acid receptor binding GO:0031755
Interacting selectively and non-covalently with an Edg-2 lysophosphatidic acid receptor.
1 Q99MK8 (/ISO)

There are 54 GO terms relating to "biological process"

The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.
GO Term Annotations Evidence
Desensitization of G-protein coupled receptor protein signaling pathway GO:0002029
The process that stops, prevents, or reduces the frequency, rate or extent of G-protein coupled receptor protein signaling pathway activity after prolonged stimulation with an agonist of the pathway.
4 P21146 (/IMP) P26817 (/IMP) P26819 (/IMP) Q99MK8 (/IMP)
Protein phosphorylation GO:0006468
The process of introducing a phosphate group on to a protein.
4 P21146 (/IDA) P26817 (/IDA) P26819 (/IDA) Q99MK8 (/IDA)
Heart development GO:0007507
The process whose specific outcome is the progression of the heart over time, from its formation to the mature structure. The heart is a hollow, muscular organ, which, by contracting rhythmically, keeps up the circulation of the blood.
3 B5LZ08 (/IMP) Q801U1 (/IMP) Q99MK8 (/IMP)
Desensitization of G-protein coupled receptor protein signaling pathway GO:0002029
The process that stops, prevents, or reduces the frequency, rate or extent of G-protein coupled receptor protein signaling pathway activity after prolonged stimulation with an agonist of the pathway.
2 P26817 (/IC) P26819 (/IC)
Desensitization of G-protein coupled receptor protein signaling pathway GO:0002029
The process that stops, prevents, or reduces the frequency, rate or extent of G-protein coupled receptor protein signaling pathway activity after prolonged stimulation with an agonist of the pathway.
2 P26817 (/IDA) P26819 (/IDA)
Negative regulation of the force of heart contraction by chemical signal GO:0003108
Any process which decreases the force of heart muscle contraction mediated by chemical signaling, hormonal, autocrine or paracrine.
2 P21146 (/IMP) P25098 (/IMP)
Heart rudiment formation GO:0003315
The developmental process pertaining to the initial formation of the heart rudiment.
2 B5LZ08 (/IGI) Q801U1 (/IGI)
Intracellular protein transport GO:0006886
The directed movement of proteins in a cell, including the movement of proteins between specific compartments or structures within a cell, such as organelles of a eukaryotic cell.
2 P21146 (/IMP) P26819 (/IMP)
G-protein coupled receptor signaling pathway GO:0007186
A series of molecular signals that proceeds with an activated receptor promoting the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. The GTP-bound activated alpha-G-protein then dissociates from the beta- and gamma-subunits to further transmit the signal within the cell. The pathway begins with receptor-ligand interaction, or for basal GPCR signaling the pathway begins with the receptor activating its G protein in the absence of an agonist, and ends with regulation of a downstream cellular process, e.g. transcription. The pathway can start from the plasma membrane, Golgi or nuclear membrane (PMID:24568158 and PMID:16902576).
2 P26817 (/IDA) Q99MK8 (/IDA)
Smoothened signaling pathway GO:0007224
A series of molecular signals generated as a consequence of activation of the transmembrane protein Smoothened.
2 B5LZ08 (/IGI) Q801U1 (/IGI)
Smoothened signaling pathway GO:0007224
A series of molecular signals generated as a consequence of activation of the transmembrane protein Smoothened.
2 B5LZ08 (/IMP) Q801U1 (/IMP)
Regulation of heart contraction GO:0008016
Any process that modulates the frequency, rate or extent of heart contraction. Heart contraction is the process in which the heart decreases in volume in a characteristic way to propel blood through the body.
2 B5LZ08 (/IMP) Q801U1 (/IMP)
Peptidyl-serine phosphorylation GO:0018105
The phosphorylation of peptidyl-serine to form peptidyl-O-phospho-L-serine.
2 P21146 (/IDA) Q99MK8 (/IDA)
Receptor internalization GO:0031623
A receptor-mediated endocytosis process that results in the movement of receptors from the plasma membrane to the inside of the cell. The process begins when cell surface receptors are monoubiquitinated following ligand-induced activation. Receptors are subsequently taken up into endocytic vesicles from where they are either targeted to the lysosome or vacuole for degradation or recycled back to the plasma membrane.
2 P25098 (/IDA) P35626 (/IDA)
Receptor internalization GO:0031623
A receptor-mediated endocytosis process that results in the movement of receptors from the plasma membrane to the inside of the cell. The process begins when cell surface receptors are monoubiquitinated following ligand-induced activation. Receptors are subsequently taken up into endocytic vesicles from where they are either targeted to the lysosome or vacuole for degradation or recycled back to the plasma membrane.
2 Q3UYH7 (/ISO) Q99MK8 (/ISO)
Chordate embryonic development GO:0043009
The process whose specific outcome is the progression of the embryo over time, from zygote formation through a stage including a notochord and neural tube until birth or egg hatching.
2 B5LZ08 (/IMP) Q801U1 (/IMP)
Negative regulation of striated muscle contraction GO:0045988
Any process that stops, prevents, or reduces the frequency, rate or extent of striated muscle contraction.
2 P21146 (/IMP) P25098 (/IMP)
Muscle cell development GO:0055001
The process whose specific outcome is the progression of a muscle cell over time, from its formation to the mature structure. Muscle cell development does not include the steps involved in committing an unspecified cell to the muscle cell fate.
2 B5LZ08 (/IGI) Q801U1 (/IGI)
Muscle cell development GO:0055001
The process whose specific outcome is the progression of a muscle cell over time, from its formation to the mature structure. Muscle cell development does not include the steps involved in committing an unspecified cell to the muscle cell fate.
2 B5LZ08 (/IMP) Q801U1 (/IMP)
Cardiac muscle contraction GO:0060048
Muscle contraction of cardiac muscle tissue.
2 P21146 (/IMP) P25098 (/IMP)
Positive regulation of protein phosphorylation GO:0001934
Any process that activates or increases the frequency, rate or extent of addition of phosphate groups to amino acids within a protein.
1 P26819 (/IDA)
Regulation of the force of heart contraction GO:0002026
Any process that modulates the extent of heart contraction, changing the force with which blood is propelled.
1 Q99MK8 (/IGI)
Desensitization of G-protein coupled receptor protein signaling pathway GO:0002029
The process that stops, prevents, or reduces the frequency, rate or extent of G-protein coupled receptor protein signaling pathway activity after prolonged stimulation with an agonist of the pathway.
1 Q99MK8 (/IGI)
Desensitization of G-protein coupled receptor protein signaling pathway GO:0002029
The process that stops, prevents, or reduces the frequency, rate or extent of G-protein coupled receptor protein signaling pathway activity after prolonged stimulation with an agonist of the pathway.
1 P25098 (/ISS)
G-protein coupled receptor internalization GO:0002031
The process that results in the uptake of a G-protein coupled receptor into an endocytic vesicle.
1 P21146 (/IDA)
Negative regulation of the force of heart contraction by chemical signal GO:0003108
Any process which decreases the force of heart muscle contraction mediated by chemical signaling, hormonal, autocrine or paracrine.
1 Q99MK8 (/ISO)
Protein phosphorylation GO:0006468
The process of introducing a phosphate group on to a protein.
1 P26819 (/IMP)
Response to oxidative stress GO:0006979
Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of oxidative stress, a state often resulting from exposure to high levels of reactive oxygen species, e.g. superoxide anions, hydrogen peroxide (H2O2), and hydroxyl radicals.
1 P26817 (/IDA)
Signal transduction GO:0007165
The cellular process in which a signal is conveyed to trigger a change in the activity or state of a cell. Signal transduction begins with reception of a signal (e.g. a ligand binding to a receptor or receptor activation by a stimulus such as light), or for signal transduction in the absence of ligand, signal-withdrawal or the activity of a constitutively active receptor. Signal transduction ends with regulation of a downstream cellular process, e.g. regulation of transcription or regulation of a metabolic process. Signal transduction covers signaling from receptors located on the surface of the cell and signaling via molecules located within the cell. For signaling between cells, signal transduction is restricted to events at and within the receiving cell.
1 P35626 (/TAS)
G-protein coupled receptor signaling pathway GO:0007186
A series of molecular signals that proceeds with an activated receptor promoting the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. The GTP-bound activated alpha-G-protein then dissociates from the beta- and gamma-subunits to further transmit the signal within the cell. The pathway begins with receptor-ligand interaction, or for basal GPCR signaling the pathway begins with the receptor activating its G protein in the absence of an agonist, and ends with regulation of a downstream cellular process, e.g. transcription. The pathway can start from the plasma membrane, Golgi or nuclear membrane (PMID:24568158 and PMID:16902576).
1 P21146 (/ISS)
G-protein coupled acetylcholine receptor signaling pathway GO:0007213
Any series of molecular signals initiated by an acetylcholine receptor on the surface of the target cell binding to one of its physiological ligands, and proceeding with the activated receptor promoting the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. The GTP-bound activated alpha-G-protein then dissociates from the beta- and gamma-subunits to further transmit the signal within the cell. The pathway begins with receptor-ligand interaction and ends with regulation of a downstream cellular process, e.g. transcription.
1 P21146 (/IDA)
G-protein coupled acetylcholine receptor signaling pathway GO:0007213
Any series of molecular signals initiated by an acetylcholine receptor on the surface of the target cell binding to one of its physiological ligands, and proceeding with the activated receptor promoting the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. The GTP-bound activated alpha-G-protein then dissociates from the beta- and gamma-subunits to further transmit the signal within the cell. The pathway begins with receptor-ligand interaction and ends with regulation of a downstream cellular process, e.g. transcription.
1 P25098 (/ISS)
Tachykinin receptor signaling pathway GO:0007217
The series of molecular signals generated as a consequence of a tachykinin, i.e. a short peptide with the terminal sequence (Phe-X-Gly-Leu-Met-NH2), binding to a cell surface receptor.
1 P25098 (/IDA)
Tachykinin receptor signaling pathway GO:0007217
The series of molecular signals generated as a consequence of a tachykinin, i.e. a short peptide with the terminal sequence (Phe-X-Gly-Leu-Met-NH2), binding to a cell surface receptor.
1 Q99MK8 (/ISO)
Aging GO:0007568
A developmental process that is a deterioration and loss of function over time. Aging includes loss of functions such as resistance to disease, homeostasis, and fertility, as well as wear and tear. Aging includes cellular senescence, but is more inclusive. May precede death and may succeed developmental maturation (GO:0021700).
1 P26817 (/IEP)
Regulation of signal transduction GO:0009966
Any process that modulates the frequency, rate or extent of signal transduction.
1 P21146 (/IMP)
Multicellular organism aging GO:0010259
An aging process that has as participant a whole multicellular organism. Multicellular organism aging includes loss of functions such as resistance to disease, homeostasis, and fertility, as well as wear and tear. Multicellular organisms aging includes processes like cellular senescence and organ senescence, but is more inclusive. May precede death (GO:0016265) of an organism and may succeed developmental maturation (GO:0021700).
1 P26819 (/IEP)
Response to organic cyclic compound GO:0014070
Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an organic cyclic compound stimulus.
1 P26817 (/IDA)
Peptidyl-serine phosphorylation GO:0018105
The phosphorylation of peptidyl-serine to form peptidyl-O-phospho-L-serine.
1 P25098 (/ISS)
Peptidyl-threonine phosphorylation GO:0018107
The phosphorylation of peptidyl-threonine to form peptidyl-O-phospho-L-threonine.
1 Q99MK8 (/IDA)
Viral genome replication GO:0019079
Any process involved directly in viral genome replication, including viral nucleotide metabolism.
1 P25098 (/IMP)
Viral genome replication GO:0019079
Any process involved directly in viral genome replication, including viral nucleotide metabolism.
1 Q99MK8 (/ISO)
Positive regulation of catecholamine secretion GO:0033605
Any process that activates or increases the frequency, rate or extent of the regulated release of a catecholamine.
1 P26817 (/IDA)
Positive regulation of catecholamine secretion GO:0033605
Any process that activates or increases the frequency, rate or extent of the regulated release of a catecholamine.
1 P25098 (/ISS)
Response to hydrogen peroxide GO:0042542
Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a hydrogen peroxide (H2O2) stimulus.
1 P26817 (/IEP)
Follicle-stimulating hormone signaling pathway GO:0042699
The series of molecular signals mediated by follicle-stimulating hormone.
1 P26817 (/IDA)
Inositol phosphate metabolic process GO:0043647
The chemical reactions and pathways involving inositol phosphate, 1,2,3,4,5,6-cyclohexanehexol, with one or more phosphate groups attached.
1 P26819 (/IMP)
Negative regulation of G-protein coupled receptor protein signaling pathway GO:0045744
Any process that stops, prevents, or reduces the frequency, rate or extent of G-protein coupled receptor protein signaling pathway activity.
1 P26819 (/IC)
Negative regulation of G-protein coupled receptor protein signaling pathway GO:0045744
Any process that stops, prevents, or reduces the frequency, rate or extent of G-protein coupled receptor protein signaling pathway activity.
1 P26817 (/IDA)
Negative regulation of striated muscle contraction GO:0045988
Any process that stops, prevents, or reduces the frequency, rate or extent of striated muscle contraction.
1 Q99MK8 (/ISO)
Rhodopsin metabolic process GO:0046154
The chemical reactions and pathways involving rhodopsin, a brilliant purplish-red, light-sensitive visual pigment found in the rod cells of the retinas.
1 P26819 (/IMP)
Viral entry into host cell GO:0046718
The process that occurs after viral attachment by which a virus, or viral nucleic acid, breaches the plasma membrane or cell envelope and enters the host cell. The process ends when the viral nucleic acid is released into the host cell cytoplasm.
1 P25098 (/IMP)
Viral entry into host cell GO:0046718
The process that occurs after viral attachment by which a virus, or viral nucleic acid, breaches the plasma membrane or cell envelope and enters the host cell. The process ends when the viral nucleic acid is released into the host cell cytoplasm.
1 Q99MK8 (/ISO)
Cardiac muscle contraction GO:0060048
Muscle contraction of cardiac muscle tissue.
1 Q99MK8 (/ISO)

There are 23 GO terms relating to "cellular component"

The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.
GO Term Annotations Evidence
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
4 P21146 (/IDA) P25098 (/IDA) P26819 (/IDA) Q99MK8 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
2 P25098 (/IDA) P26817 (/IDA)
Cytosol GO:0005829
The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
2 P21146 (/IDA) P26819 (/IDA)
Cytosol GO:0005829
The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
2 P25098 (/TAS) P35626 (/TAS)
Plasma membrane GO:0005886
The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
2 P25098 (/TAS) P35626 (/TAS)
Cilium GO:0005929
A specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface and of some cytoplasmic parts. Each cilium is largely bounded by an extrusion of the cytoplasmic (plasma) membrane, and contains a regular longitudinal array of microtubules, anchored to a basal body.
2 P25098 (/TAS) Q99MK8 (/TAS)
Axon GO:0030424
The long process of a neuron that conducts nerve impulses, usually away from the cell body to the terminals and varicosities, which are sites of storage and release of neurotransmitter.
2 P26817 (/IDA) P26819 (/IDA)
Dendritic spine GO:0043197
A small, membranous protrusion from a dendrite that forms a postsynaptic compartment - typically receiving input from a single presynapse. They function as partially isolated biochemical and an electrical compartments. Spine morphology is variable including \thin\, \stubby\, \mushroom\, and \branched\, with a continuum of intermediate morphologies. They typically terminate in a bulb shape, linked to the dendritic shaft by a restriction. Spine remodeling is though to be involved in synaptic plasticity.
2 P26817 (/IDA) P26819 (/IDA)
Dendritic shaft GO:0043198
Cylindric portion of the dendrite, directly stemming from the perikaryon, and carrying the dendritic spines.
2 P26817 (/IDA) P26819 (/IDA)
Synapse GO:0045202
The junction between a nerve fiber of one neuron and another neuron, muscle fiber or glial cell. As the nerve fiber approaches the synapse it enlarges into a specialized structure, the presynaptic nerve ending, which contains mitochondria and synaptic vesicles. At the tip of the nerve ending is the presynaptic membrane; facing it, and separated from it by a minute cleft (the synaptic cleft) is a specialized area of membrane on the receiving cell, known as the postsynaptic membrane. In response to the arrival of nerve impulses, the presynaptic nerve ending secretes molecules of neurotransmitters into the synaptic cleft. These diffuse across the cleft and transmit the signal to the postsynaptic membrane.
2 P26817 (/IDA) P26819 (/IDA)
Nucleus GO:0005634
A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
1 P26819 (/IDA)
Cytoplasm GO:0005737
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
1 Q99MK8 (/ISO)
Caveola GO:0005901
A membrane raft that forms small pit, depression, or invagination that communicates with the outside of a cell and extends inward, indenting the cytoplasm and the cell membrane. Examples include flask-shaped invaginations of the plasma membrane in adipocytes associated with caveolin proteins, and minute pits or incuppings of the cell membrane formed during pinocytosis. Caveolae may be pinched off to form free vesicles within the cytoplasm.
1 P26817 (/IDA)
Cilium GO:0005929
A specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface and of some cytoplasmic parts. Each cilium is largely bounded by an extrusion of the cytoplasmic (plasma) membrane, and contains a regular longitudinal array of microtubules, anchored to a basal body.
1 P26819 (/IDA)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
1 P21146 (/IC)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
1 Q99MK8 (/ISO)
Membrane GO:0016020
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
1 P25098 (/ISS)
Basolateral plasma membrane GO:0016323
The region of the plasma membrane that includes the basal end and sides of the cell. Often used in reference to animal polarized epithelial membranes, where the basal membrane is the part attached to the extracellular matrix, or in plant cells, where the basal membrane is defined with respect to the zygotic axis.
1 P26817 (/IDA)
Apical plasma membrane GO:0016324
The region of the plasma membrane located at the apical end of the cell.
1 P26817 (/IDA)
Z disc GO:0030018
Platelike region of a muscle sarcomere to which the plus ends of actin filaments are attached.
1 P26819 (/IDA)
Dendrite terminus GO:0044292
A structure at the distal end of a dendrite adapted to carry out a specific function, e.g. dendriole.
1 P26819 (/IDA)
Perinuclear region of cytoplasm GO:0048471
Cytoplasm situated near, or occurring around, the nucleus.
1 P26819 (/IDA)
Sperm midpiece GO:0097225
The highly organized segment of the sperm flagellum which begins at the connecting piece and is characterized by the presence of 9 outer dense fibers (ODFs) that lie outside each of the 9 outer axonemal microtubule doublets and by a sheath of mitochondria that encloses the ODFs and the axoneme; the midpiece terminates about one-fourth of the way down the sperm flagellum at the annulus, which marks the beginning of the principal piece.
1 P26819 (/IDA)