Light micrograph showing a cross section through a hair follicle. The hair shaft is made up of hard dead protein called keratin, which is observed in the center. This is surrounded by skin cells that have been packed together to form the hair follcle. The follicle is surrounded by two layers of cells including erector pili muscle, which causes the hair to stand on 'end'.
B0007314 Cross section of hair follicle. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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