isotype

iso·type

noun \ˈī-sə-ˌtīp\

Definition of ISOTYPE

: any of the categories of antibodies determined by their physicochemical properties (as molecular weight) and antigenic characteristics that occur in all individuals of a species—compare allotype, idiotype

—iso·typ·ic \ˌī-sə-ˈtip-ik\ adjective

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