melanin synthesis during melanosome maturation process diagram

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