Figure 1.

Keratinocyte viability after irradiation of the control groups without growth factor treatment: (a) Y–axis shows absorbance on 1 d, 4 d, and 7 d after 0, 2, 5 Gy irradiation; (b) representative images of irradiated keratinocytes without growth factor supplementation at time point 7 d stained with DAPI (blue = living cells). * p ≤ 0.05, significances were correlated to the non-irradiated respective control. * = significant compared to the control without growth factors in the respective irradiation dose at the respective time point. # = significances were correlated to the control on day 1. Scale bar 100 µm.