You can start browsing through the CATH tree by starting at the least discriminatory classification level (Class) then working your way through to more discriminatory collections of domains ( Architecture, Topology, then Homologous Superfamily).
You can search CATH with identifiers such as:
You can perform a quick BLAST search of the sequences in CATH by submitting a FASTA sequence.
Sorry we couldn't find anything matching the query 'World Is Open' in this version of CATH.