Abstract
DNA synthetic activity was studied by autoradiography in unilaterally cryptorchid (abdominal) and contralateral intact (scrotal) testes in mice. Nongerm cells were inactive in DNA synthesis in both the cryptorchid testis and the intact control. Labeling indices of undifferentiated type A spermatogonia did not show any differences, indicating that type A spermatogonia are not temperature sensitive in DNA synthesis in vivo.
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