• open in new windowOCA© - a browser-database for structure/function
• PDB - 3-D biological macromolecular structure open in new windowat Weizmann or open in new windowat RCSB
• Cambridge Structural Database
• SCOP - Structural Classification of Proteins, at Weizmann or open in new windowat UC Berkeley
• BLOCKS - multiply aligned ungapped segments corresponding to the most highly conserved regions of proteins, at Weizmann, or open in new windowat FHCRC (Blocks home site)
• PFam - Protein families database of alignments and HMMs at Sanger
• open in new windowCOPE - Cytokines Online Pathfinder Encyclopaedia
• open in new windowInterPro - a database of protein families, domains and functional sites, at EBI
• FSSP - a database of Families of Structurally Similar Proteins
• open in new windowDALI server - a network service for comparing protein structures in 3D, at EBI
• open in new windowEBI2CAN page - for various protein databases
• open in new windowExPasy server - for various protein databases
• open in new windowPhyloFacts - Structural phylogenomic encyclopedia for Protein functional classification
• open in new windowHPRD - The Human Protein Reference Database
  for protein iformation: domain architecture, post-translational modifications, interaction networks and disease association.
• open in new windowPANTHER - (Protein ANalysis THrough Evolutionary Relationships) Classification System is a unique resource that classifies genes by their functions
• open in new windowProtoNet - provides global classification of the proteins into hierarchical clusters
• open in new windowMiST database - Signal transduction proteins for bacterial and archaeal genomes