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Biosynthesis pathway of melatonin in rice plants subjected to normal and adverse growth conditions. TDC, tryptophan decarboxylase; T5H, tryptamine-5-hydroxylase; ASMT, N-acetylserotonin methyltransferase; COMT, acetylserotonin O-methyltransferase; SNAT, serotonin N-acetyltransferase.
