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. 2020 Jul 23;7:439. doi: 10.3389/fvets.2020.00439

Figure 1.

Figure 1

Confirmation of radioresistance using colony formation and SRB assays. (A) Colony formation assays comparing MCF-7, ZR-751, MDA-MB-231, and REM-134 cell lines with their derived RR cell lines at 10–14 days post-radiation treatment. (B) SRB assays comparing MCF-7, ZR-751, MDA-MB-231, and REM-134 cell lines with their derived RR cell lines at 120 h post-radiation treatment. (C) SRB assays comparing REM-134, REM-134 RR, and REM-134 rr cell lines at 120 h post-radiation treatment. The REM-134 rr is a radioresistant cell line that had not been radiated for 6 months (24 passages) before the experiment (2-way ANOVA with Holm-Šídák multiple comparisons test; data expressed as mean ± SEM, n = 3, ****p ≤ 0.0001; ***p ≤ 0.001; **p ≤ 0.01; *p ≤ 0.05).