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Effects of PDGF1 (A), PDGF2 (B), and PDGF2-HTT (C) on the proliferation of human 46BR.1N fibroblasts, HaCaT keratinocytes, and human dermal primary fibroblasts. Graphs show the results of four independent experiments, which are presented as the mean ± SEM (*statistically significant difference, Mann–Whitney U-test, p < 0.05).
