Definition of neuromelanin
: a dark melanin pigment found especially in some dopaminergic neurons of the human substantia nigra Substantia nigra means, literally, "black substance"; researchers now understand that these cells gain their dark coloration from the oxidation of dopamine to form the black pigment neuromelanin.— C. Warren Olanow and Ted L. Rothstein — compare eumelanin, pheomelanin
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