Figure 1

Proliferation of mouse dermal papilla cells (DPCs) (a) and human dermal papilla cells (b) on days 1, 3, and 5 after addition of various concentrations of activated platelet-rich plasma (PRP). The addition of 1% and 5% activated PRP to the culture medium promoted cell proliferation. Maximal promotion occurred with 5% PRP; 10% or 15% PRP did not promote further. *p < 0.05 vs. control and &p < 0.05 vs. 1% PRP.