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Effect of retinoic acid (RA) isomer concentrations on the growth of human breast cancer MCF-7 cells (A) and MDA-MB-231 cells (B). MCF-7 cells and MDA-MB-231 cells were seeded at 3×104 cells and incubated with various concentrations of RA isomers for 4 days. The viability of Cells were measured by MTT assay. Values are means ± S.D. of three independent experiments. *P<0.05: compared to the control
