1. Biology. a type specimen of the sex opposite to that of the holotype.
  2. Immunology. an antibody of a given class having certain molecular sites shared by only some members of a species and therefore acting as an antigen to other members of the same species.


  1. biology an additional type specimen selected because of differences from the original type specimen, such as opposite sex or morphological details
  2. immunol any of the variant forms of a particular immunoglobulin found among members of the same species


  1. Any of the genetically determined variants in the constant region of a given subclass of immunoglobulin that is detectable as an antigen by members of the same species having a different constant region.

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