The effects of thyroxine and 5α-dihydrotestosterone on the activities of various marker enzymes in the submandibular glands of immature mice were studied. The responsiveness to thyroid hormone appeared at latest by day five after birth, which was ten d earlier than the appearance of androgen responsiveness. The activity of trypsin-like esteroprotease, however, was not increased by these hormones until day 15 after birth.
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