Hair follicle, light micrograph

Hair follicle, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Hair follicle. Polarised light micrograph of a transverse section through a human hair follicle (purple). Hair (black) is formed from the protein keratin. It is a dead tissue that is pushed up by growth from the bulb (bottom left) at the base of the follicle, which lies in the dermis layer of the skin. To the right of the follicle is a sebaceous gland (light purple). Sebaceous glands secrete an oily fluid called sebum onto the hair, which waterproofs and protects it. Magnification: x70 when printed at 10 centimetres wide.

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Keywords: biological, biology, bulb, dermis, follicle, hair, histological, histology, human tissue, illustration, keratin, light micrograph, light microscope, no-one, nobody, polarised light micrograph, root, sebaceous gland, sebum, section, sectioned, skin

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