Exogenous IGF-1 promotes hair growth by stimulating cell proliferation and down regulating TGF-β1 in

Compared with the control 24 h, the cell proliferation ratios in the IGF-1 5-ng and 50-ng groups were significantly larger after 48 h and 72 h chases (D). The peak number of proliferative cells appeared at 48 h. Values are means ± SD; *P < 0.05, **P < 0.0

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