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.
SO:0001070
polypeptide_structural_region
is_a
SO:0100021
polypeptide_conserved_region
is_a
domain
broad
polypeptide domain
exact
polypeptide_structural_domain
exact
structural domain
broad