isotype

A biological specimen or other element that is a duplicate of the holotype.

Any of the subclasses of immunoglobulins defined by the chemical and antigenic characteristics of their constant regions.

In zoögeog., a form common to two or more countries: applied to representatives of the same genus or family occurring in different countries.

A marker corresponding to an antigen found in all members of a subclass of a specific class of immunoglobulins