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Abstract
The effect of the steel mutation on spermatogenesis was investigated using organ culture. Cultured cryptorchid testes from WB-+/+ mice showed an effective differentiation of type A spermatogonia in response to Pedersen type III fetuin. In contrast, the cryptorchid testes from WB-S1/+ showed neither differentiation nor division of type A spermatogonia. The findings reported here are the first demonstration of retarded response of steel mutation on a well-known agent, fetuin.