entry type	number of entries
structures	104,569
structures (PDB)	49,295
structures (PQS)	55,274
domains	598,638
domains (SCOP v1.73)	212,071
domains (CATH v3.1.0)	191,915
domains (chain)	194,652
interfaces	755,998
interfaces (SCOP v1.73)	269,821
interfaces (CATH v3.1.0)	269,438
interfaces (chain)	216,739