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. 1990;97(2):175-8.
doi: 10.1016/0300-9629(90)90166-p.

Ontogeny of N-acetyltransferase activity rhythm in pineal gland of chick embryo

M Zeman  1 , H Illnerová
Affiliations

Ontogeny of N-acetyltransferase activity rhythm in pineal gland of chick embryo

M Zeman et al. Comp Biochem Physiol A Comp Physiol. 1990.

Abstract

1. N-acetyltransferase was present in pineal glands of 14-day-old chick embryos though no rhythm either in LL, DD or LD 12:12 was observed in this age. 2. Daily rhythm in pineal NAT activity was found in 18-day-old embryos incubated under LD 12:12 and LD 16:8 but no NAT rhythm was detected in DD or LL. 3. NAT rhythm persists for 2 days in constant darkness and it may be circadian in nature. 4. Presence of melatonin (85 +/- 8 pg/mg tissue) was detected in pineals of 18-day-old chick embryos.

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