allotope

al·lo·tope

(al'ō-tōp), Do not confuse this word with allotrope.A polymorphic region constituting antigenic determinant on the constant region of an allotype. [allo- + -tope]

allotope

A non-varying (biochemically constant) region of an antibody.

al·lo·tope

(al'ō-tōp) The antigenic determinant of an allotype.