G3BP1 and cancer: To test this, we used MCF‐10A non‐cancer cells, which, unlike cancer cells, contain no ROS or the amount is too low to be detectable without any treatment.[19] First, we established that arsenite stimulation of MCF‐10A cells resulted in SG assembly, as detected by the accumulation of cytoplasmic G3BP1 foci (Figure 4 A).