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Table 2 Number of entries from the PDB.

From: Columba: an integrated database of proteins, structures, and annotations

from PDB to Number of entries
  SCOP 42 908
  CATH 32 825
  DSSP 54 028
chains (total 60 241) Swiss- Prot 36 651
  NCBI Taxonomy 36 651
  Gene Ontology via GOA 36 008
  PISCES 8 367
  SCOP & CATH 32 439
  SCOP & CATH & Swiss-Prot 27 972
  Enzyme 12 510
  Boehringer 5 029
7162 compounds (total 33 779) KEGG 7 162 7 162 9 172
  Enzyme & KEGG 7 162
  Enzyme & SCOP & CATH 9 172
  Enzyme & SCOP & CATH & KEGG 5 054
  Enzyme & Swiss-Prot 9 440
entries (total 26 104) all minus PISCES 2 868
  all 621
  1. They are divided into compounds and chains, which link to second-party databases and selected combinations of them.