Antibodies to Spermatozoa in Male Monkeys: Mode of Action**Publication No. 990 from the Oregon Regional Primate Research Center. Supported by Northwestern University/PARFR Subcontract 70N under Subcontract AID/csd-3608, National Institutes of Health Grant RR000163 and Contract NO-1-4-2866.††Presented in part at the Thirty-Fourth Annual Meeting of The American Fertility Society, March 29 to April 1, 1978, New Orleans, La.