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Melanin Basal Cell Carcinoma Carcinoma Lentigo, Solar Malignant Melanocytes Melanoma Nevus Squamous Cell Carcinoma Dark brown to black polymers that normally occur in the skin, hair, pigmented coat of the reina, and inconstantly in the medulla and zona reticularis of the adrenal gland. The material may be formed in vitro or biologically by oxidation of tyrosine or tryptophan.