Abstract
(1) The data of the present experiments indicate that the protein-synthesizing systems of the rat testis, and especially those found in the spermatids, are more sensitive to heat as compared to the protein-synthesizing systems of other tissues of the rat. It is suggested that this increased heat lability of the protein-synthesizing systems of the testis may offer a partial biochemical explanation for the injurious effects of an increased abdominal temperature on spermatogenesis which occurs in cases of cryptorchidism.

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