Abstract
“Exchange agglutination,” a new test for detecting mammalian sperm surface antigens, is described. This test is based on two facts: (1) that univalent (Fab) antibody fragments prevent the spontaneous agglutination frequently observed in sperm suspensions of many mammalian species and (2) that multivalent antibody will compete favorably and apparently exchange with the univalent antibody producing specific agglutination with high precision and sensitivity. Using this method, rabbit sperm agglutinated with iSoantisera to purified rabbit sperm hyaluronidase but failed to do so with antisera to the lactoferrin-like iron binding protein of rabbit seminal plasma. Natural rabbit sperm agglutinins were found in normal goat globulin by this exchange agglutination test. Sperm agglutination by antibodies and
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