melanocyte biology and skin tone pigmentation diagram

melanocyte skin pigmentation melanin keratinocyte melanosome anatomy epidermis tone pigment hair complexion basal dendrite structure tissue diagram synthesis growth graphic infographic membrane cluster dark light hyperpigmentation vitiligo cell health medicine body freckles human brown illustration eumelanin pheomelanin dermatology skincare melasma africanamerican asian caucasian hispanic crosssection vector process ultraviolet tan