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Homoisoflavanone-1 induces apoptosis in A549 cells. (A) A549 cells were exposed to 0, 12.5, 25, 50 or 100 µg/ml homoisoflavanone-1 for 24 h, prior to analysis by (A) flow cytometry. (B) Histogram of the rate of apoptosis as determined by FACS analysis for three separate treatments. *P<0.05; **P<0.01 vs. the control. FACS, fluorescence-activated cell sorting.
