› Antioxidant
› Bence-Jones protein
› Blood group antigen
› Calmodulin-binding
› Actin capping
› Chaperone
› Chromatin regulator
› Cyclin
› Cytokine
› Developmental protein
› DNA invertase
› DNA replication inhibitor
› DNA-binding
› Elongation factor
› Endorphin
› Excision nuclease
› Eye lens protein
› Growth factor
› Growth factor binding
› GTPase activation
› Guanine-nucleotide releasing factor
› Hemagglutinin
› Heparin-binding
› Hormone
› Hydrolase
› Hypotensive agent
› Ice nucleation
› IgA-binding protein
› IgE-binding protein
› IgG-binding protein
› Initiation factor
› Integrin
› Ion channel
› Isomerase
› Leader peptide
› Ligase
› Light-harvesting polypeptide
› Lyase
› Metalloenzyme inhibitor
› Milk protein
› Mitogen
› Mobility protein
› Monoclonal antibody
› Morphogen
› Motor protein
› Multifunctional enzyme
› Muscle protein
› Mutator protein
› Neuropeptide
› Neurotransmitter
› Viral nucleoprotein
› Opioid peptide
› Oxidoreductase
› Pathogenesis-related protein
› Pheromone
› Phospholipase A2 inhibitor
› Photoprotein
› Porin
› Prion
› Protease inhibitor
› Protein kinase inhibitor
› Protein phosphatase inhibitor
› Protein synthesis inhibitor
› Prothrombin activator
› Pyrogen
› Receptor
› Repressor
› Ribonucleoprotein
› RNA-binding
› Serine protease homolog
› Sigma factor
› Signal transduction inhibitor
› Silk protein
› Storage protein
› Superantigen
› Taste-modifying protein
› Toxin
› Transducer
› Transferase
› Tumor antigen
› Vasoactive
› Amphibian defense peptide
› Viral movement protein
› Antimicrobial
› Antiviral protein
› Suppressor of RNA silencing
› Translational shunt
› Viral contractile tail ejection system
› Viral long flexible tail ejection system
› Viral short tail ejection system