(a) RT-PCR analysis of SOX11 and NTRK1 levels in the CRISPR activation experiments. (−), no virus infection control. NT, non-targeting sgRNA control. Data are mean ± SEM. (n = 3 biological replicates) (b) Western blot confirming the elevation of SOX11 level upon CRISPR activation. ACTB was used as a loading control. (c) Competition-based proliferation assay evaluating the effects of candidate gene activation, using CRISPR activation (CRISPRa), to cell fitness in non-Ewing cancer cell lines (RD, U2OS and SUIT2). The percentage of GFP positive cells was monitored during culturing. Data are mean ± SEM. (n = 3 biological replicates) (d) Gene expression changes of SOX11 and NTRK1 in different cell lines assessed by RNA-seq. The significant expression changes (p