(a) Chemical structure of salinomycin, etoposide, abamectin, and nigericin and dose-response curves of control HMLE-shCntrl cells and HMLE-shEcad cells treated with indicated compounds. (b) Dose-response curves of the viability of HMLE-shCntrl and HMLE-Twist cells. (c) Dose-response curves of control HMLER and HMLER-shEcad tumorigenic mammary epithelial cells treated with salinomycin, etoposide, abamectin, or nigericin. Each treatment combination was performed in at least 6 replicates.