Sugar 101. Naturally occurring sugars and added sugars. There are two types of sugars in American diets: naturally occurring sugars and added sugars. Naturally occurring sugars are found naturally in foods such as fruit (fructose) and milk (lactose).
Epidermis, in zoology, protective outermost portion of the skin. There are two layers of epidermis, the living basal layer, which is next to the dermis, and the external stratum corneum, or horny layer, which is composed of dead, keratin-filled cells that have migrated outward from the basal layer. The melanocytes, responsible for skin colour, are found in the basal cells.
Layers of the Epidermis. 1  Stratum corneum: The outmost layer, made of dead keratinocytes with a layer of protein around them (they have undergone keratinization) 2  Stratum lucidum: Also dead keratinocytes (there is no real distinction here other than that the poor keratinocytes have died but have not finished the keratinization process)