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Analysis of survival fractions in cells exposed to X-rays with or without N-dihydrogalactochitosan (GC) pre-treatment. Cells were treated with 100 μg/mL of GC for 24 h before irradiation at different doses. The colony formation assay was used to compare the survival curves of (A) 4T1 cells and (B) 4T1_L_3R cell; * p < 0.05.
