Forssman antigen[fōrs′măn]


1. a type of heterogenetic antigen found in dogs, horses, sheep, cats, turtles, eggs of some fish, in certain bacteria (some strains of enteric organisms and pneumococci), and varieties of corn; usually found in the tissues and organs (not in blood), but is present in sheep erythrocytes, though not in this animal's tissues; with the exception of guinea pigs and hamsters, Forssman antigen is not found in rodents, nor in frogs, hogs, and most primates; the antibody that develops in infectious mononucleosis of humans reacts specifically with the Forssman. antigen.

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