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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.

N-乙酰转移酶存在于14日龄鸡胚的松果体中，不过在这个年龄段，无论是在持续光照、持续黑暗还是12小时光照与12小时黑暗交替的条件下均未观察到节律。2. 在12小时光照与12小时黑暗交替以及16小时光照与8小时黑暗交替条件下孵化的18日龄胚胎的松果体中发现了N-乙酰转移酶活性的每日节律，但在持续黑暗或持续光照条件下未检测到N-乙酰转移酶节律。3. N-乙酰转移酶节律在持续黑暗中持续2天，其性质可能是昼夜节律。4. 在18日龄鸡胚的松果体中检测到褪黑素（85±8皮克/毫克组织）的存在。

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.

N-乙酰转移酶存在于14日龄鸡胚的松果体中，不过在这个年龄段，无论是在持续光照、持续黑暗还是12小时光照与12小时黑暗交替的条件下均未观察到节律。2. 在12小时光照与12小时黑暗交替以及16小时光照与8小时黑暗交替条件下孵化的18日龄胚胎的松果体中发现了N-乙酰转移酶活性的每日节律，但在持续黑暗或持续光照条件下未检测到N-乙酰转移酶节律。3. N-乙酰转移酶节律在持续黑暗中持续2天，其性质可能是昼夜节律。4. 在18日龄鸡胚的松果体中检测到褪黑素（85±8皮克/毫克组织）的存在。

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