On the primary functions of melatonin in evolution: Mediation of photoperiodic signals in a unicell, photooxidation, and scavenging of free radicals

: Melatonin is widely abundant in many eukaryotic taxa, including vari‐ous animal phyla, angiosperms, and unicells. In the bioluminescent dinoflagellate Gonyaulax polyedra, melatonin is produced in concentrations sometimes exceed‐ing those found in the pineal gland, exhibits a circadian rhythm with...

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