File:Melatonin molecule ball.pngDescriptionMelatonin molecule ball.png Ball-and-stick model of the melatonin molecule, a hormone that controls the day and night cycle in animals. Color
File:Melatonin molecule spacefill.pngDescriptionMelatonin molecule spacefill.png Space-filling model of the melatonin molecule, a hormone that controls the day and night cycle in animals.
File:Pinoline 3D BS.pnglong claimed to be produced in the pineal gland during the metabolism of melatonin, however its pineal occurrence remains controversial. author name string: