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(A) K562 cells were treated with 50 µg/ml of medium (negative control), H2O extract, EtOH extract, BuOH extract, EA extract, hexane extract, or DMSO (negative control) for three days and cell viability was measured using the MTT assay. *, P < 0.05, **, P < 0.01 and ***, P < 0.005 vs. control (DMSO-treated cells).
