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1 Laboratories for Cell Biology,
Department of Anatomy, University of
North Carolina, Chapel Hill, North Carolina
Rabbit anti-mouse sperm (
MS) Fab fragments have
been prepared, which are capable of inhibiting spermzona interaction (both binding and penetration) and
sperm-egg fusion in vitro. In cumulus-intact eggs,
MS
Fab did not inhibit zona penetration, but did inhibit
sperm-egg fusion, implying that separate and distinguishable antigens are involved in these two fertilization events. Preliminary identification of the antigens
recognized by aMS IgG, using a gel overlay technique,
revealed four major antigens of 200 Kd, 55-63 Kd, 37
Kd, and 33 Kd, and three minor antigens of 110 Kd, 48
Kd, and 40 Kd.
Key words: in vitro fertilization, anti-sperm antibodies
Accepted on June 3, 1982
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