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Melanocytes are melanin pigment-producing cells responsible for skin, hair, and eye pigmentation. Melanocytes also reside in the inner ear and heart, where they play important roles in maintaining auditory and cardiac functions (Levin et al., 2009;Tachibana, 1999).During development, precursors for pigment-producing melanocytes (melanoblasts) emerge in the neural crest and migrate throughout the embryo toward specific body locations where they finally reside.In mice, melanoblasts predominantly migrate into the developing hair follicles, where they form the hair follicle pigmentary unit together with surrounding keratinocytes and dermal cells to maintain the regenerative hair pigmentation cycle throughout life (Nishimura et al., 2002). Hair pigmentation is mediated by the melanogenic

Highlights The NSI subepithelial glands in dromedaries had unique anatomical features. Their ultrastructural features are typical for APUD cells. They may have the structures required for synthesis of active peptides, amines and chemical mediators.