species-specific antigen

spe·cies-spe·cif·ic an·ti·gen

antigenic components in the tissues and fluids of members of a species of animal, by means of which various species may be immunologically distinguished; for example, serum albumin of horses is immunologically different from that of man, dogs, sheep, and so on.

spe·cies-spe·cif·ic an·ti·gen

(spē'shēz spĕ-sif'ik an'ti-jen) Antigenic components in tissues and fluids by means of which various species may be immunologically distinguished (e.g., serum albumin of horses is immunologically different from that of humans, dogs, or sheep).