0 a hormone in the body that produces changes in skin colour and is involved in controlling biorhythms such as our sleep pattern -- 降黑素（体内的一种激素，能刺激肤色变化，与日常睡眠等生物节律有关）
Evening saliva samples were obtained before and after treatment for ascertainment of circadian melatonin rhythm phase.
Cloning and characterization of a mammalian melatonin receptor that mediates reproductive and circadian responses.
Circadian clocks located in the photoreceptors and retinal neurons regulate melatonin synthesis in the eye.
Effects of supplementing pregnant heifers with methionine or melatonin on the anatomy and other characteristics of their lateral hind claws.
For instance, the relationship between melatonin and depression, the changes in testosterone levels, and diminished immune functionality cry out for further work.
Significantly higher intensities of 580- and 650-nm light were required for melatonin suppression.
During the procedure continuous measures of the circadian rhythm are taken, typically including rectal temperature, melatonin, and cortisol.
Figure 4 illustrates the biosynthetic pathway for the synthesis of melatonin from tryptophan.
