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Effects of American ginseng extracts and ginsenosides on proliferation of MCF-7 (A, C) and MDA-MB-231 (B, D) human breast cancer cells. Cells were treated with extracts (A, B) or ginsenosides (C, D) for 72 h, and then assayed by MTS method. #, p<0.01 vs. unsteamed extract; **, p<0.01 vs. control (100%).
