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Effect of isopsoralen on MC3T3-E1 cell viability. MC3T3-E1 cell viability was determined after incubation with 0, 0.1, 0.01, 0.001 or 0.0001 µM isopsoralen for 72 h. Absorbance was detected at 490 nm. *P<0.05 vs. control group. OD, optical density.
