what happen when pars intermidia get highly developed and functional in human

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Pars intermedia, a small region in pituitary gand,  secretes only one hormone, i.e., melanocyte stimulating hormone. This hormone causes production of melanin pigment in skin melanocytes. If it becomes highly developed and functional in brain, then there will be higher production of melanin. This will lead to a darker skin tone in an individual.
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