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[crickets chirp] [cymbal plays] [chime plays] [NARRATOR:] Skin covers all our bodies, but its color varies from person to person. To understand why, we need to peer inside its layers. [music plays] Skin cells and their allies--hair, sweat and oil glands--form a first line of defense from the environment. Skinamp;#39;s three main layers are each a distinct community of cells with different jobs. To see what gives skin its color, we need to focus on the outermost layer-- the epidermis-- and two important cell types: keratinocytes and melanocytes. The keratinocytes are the cells that form the surface of the skin and are on the frontline for taking insults from the environment. Deeper down in the epidermis, right at the base of the layer, we find the melanocytes. These star-shaped cells produce the important pigment melanin. Letamp;#39;s zoom inside a melanocyte to see how this works. Melanin is produced inside what look like spheres throughout the melanocyte. These are the melanosomes.
