Additional file 1: Figure S1. The clones of the CAF and CAFR group after 0, 4, 8 and 10 Gy irradiation. Representative dishes after colony-forming assay are shown. Figure S2. The senescence and proliferative capacity of CAF and CAFR. (A) Radiation-induced senescence was detected by a β-galactosidase assay. Blue color, β-gal positive cells. Percentage of β-galactosidase positive cells in each group was calculated and showed in bottom. (B) Cell proliferation curve detected by MTT. Figure...