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[110] Plants [edit] Until its identification in plants in 1987, melatonin was for decades thought to be primarily an animal neurohormone
Anwar et al., Generally, under stress conditions, plant hormonal signaling results induction of various acclimation responses, ultimately regulating plant physio-biochemical processes (Boursiac, 2015)
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Researchers first found it in human plasma, where its concentration falls with age
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