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Table 2 The number of data points in the two flavours of the PICCOLO database.

From: Comprehensive, atomic-level characterization of structurally characterized protein-protein interactions: the PICCOLO database

  PDB Structures PISA Quaternary Structures
PDBs (Assemblies) 38,202 36,762 (45,385)
Chains 141,133 157,166
Chain pairs 164,734 203,884
Residues 9,065,778 12,497,274
Residue pairs 14,618,400 20,450,685
Atoms 49,216,255 68,597,408
Atom pairs 184,639,194 260,224,802