Some texts describe melanocyte stimulating
hormone as
a hormone that regulates skin color in humans and other vertebrates.
Others also mention that it brings about colour changes in
the skin of some amphibians.
However, although an excessive amount of
melanocyte stimulating hormone in humans is
reported to cause darkening of the skin, according to the Oxford
Concise
Colour
Medical Dictionary
(1998),
"its physiological role in man is uncertain".
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