Abstract
N-acetyltransferase activity has similar circadian rhythms controlled by environmental lighting in the eyes and pineal glands of chicks (Gallus domesticus). The interactions of the two eyes and the pineal gland were examined by using patches of black tape to reduce the intensity of light reaching the eyes and/or the pineal gland. Suppression of N-acetyltransferase activity (normally 80%) by extending the light into the dark-time was used to test the effects of light. On the basis of the test, the eyes respond to light independently of each other and of the pineal gland; the pineal gland, however, responds to light perceived by the eyes.
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