binding_site SO:0000409 site binding site A biological_region of sequence that, in the molecule, interacts selectively and non-covalently with other molecules. A region on the surface of a molecule that may interact with another molecule. When applied to polypeptides: Amino acids involved in binding or interactions. It can also apply to an amino acid bond which is represented by the positions of the two flanking amino acids. http://en.wikipedia.org/wiki/Binding_site binding_or_interaction_site See GO:0005488 : binding. INSDC_feature:misc_binding sequence BS:00033 biological_region