- BRENDA the Comprehensive Enzyme Information System
- CATH protein structure classification
- CORUM Comprehensive Resource of Mammalian protein complexes
- Enzyme Portal Your portal to enzyme-related information at the EBI
- ExPASy Proteomics Server
- ExplorEnz the Enzyme Database
- Gene3D structural and functional annotation of protein families
- HPRD the Human Protein Reference Database
- HUGE database of Human Unidentified Gene-Encoded large proteins
- Human Proteinpedia a community portal for sharing and integration of human protein data
- HUPO Human Proteome Organisation
- iHOP Information Hyperlinked over Proteins
- InterPro database of protein families, domains and functional sites
- MEROPS a peptidase database
- NCBI Protein a collection of sequences from GenBank, RefSeq, TPA, SwissProt, PIR, PRF, and PDB
- IUPHAR the International Committee of Pharmacology Committee on Receptor Nomenclature and Classification
- Neuropeptides the internet resource for data about all known neuropeptides
- PDB Protein Data Bank
- Pfam protein families database of alignments and HMMs
- PhosphoSitePlus A protein modification resource
- PIR Protein Information Resource
- PMDB Protein Model Database
- SCOP Structural Classification of Proteins
- Superfamily HMM library and genome assignments server
- SWISS-PROT ENZYME enzyme nomenclature database
- TRANSFAC (Transcription Factor database)
- UniProt the universal protein resource
