Glycogen in Skin of the Mouse During Cycles of Hair Growth

Abstract
By plucking, the several stages in the hair growth cycle are obtained in mice of the C57 BL/6Ch strain. Little or no glycogen is demonstrable in the resting period or in the early periods of mitotic activity. Immediately before and during the period of actual hair production, an abundance of glycogen is present in the cells of the external sheath, especially in the middle portion. The skin as a whole has 2-3 times as much glycogen during the period of hair production as it has during the remainder of the cycle and this increase is due almost entirely to the accumulation of glycogen in the external sheaths at this time.