polypeptide_domain
A structurally or functionally defined protein region. In proteins with multiple domains, the combination of the domains determines the function of the protein. A region which has been shown to recur throughout evolution.
BS:00012
BS:00134
Range. Old definition from before biosapiens: A region of a single polypeptide chain that folds into an independent unit and exhibits biological activity. A polypeptide chain may have multiple domains.
SO:0000417
SO:0001069
domain
polypeptide domain
polypeptide_structural_domain
sequence
structural domain
polypeptide_structural_region
polypeptide_conserved_region