RACK1 and ovarian cancer: In this regard, we observed that depletion of TARG1 increased RACK1 MARylation, both by immunoprecipitation-Western and PLAs (Fig. 5, A and B; and Fig. S5, A and B) and stress granule assembly (Fig. 5, C and D; and Fig. S5 C) in OVCAR3 cells, as well as two other ovarian cancer cell lines (Fig. S5, D–G).