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The arylalkylamine N-acetyltransferase (AANAT) is a key enzyme in the rhythmic production of melatonin. Two Aanats are expressed in teleost fish, one retinal specific, Aanat1, and the other one pineal specific, Aanat2, being the latter the main enzyme responsible of the plasma nocturnal melatonin increase in fish. In anurans melatonin has been involved in metamorphosis through antagonizing thyroid...
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