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CQ inhibits NB4 cell proliferation in vitro. NB4 cells were treated with CQ at various concentrations. After 48 and 72 h of incubation, cell viability was analyzed using an MTS assay. The data are presented as the mean ± standard deviation of 6 separate experiments. *P<0.05 compared with the 0 µM control group at the corresponding time-points.
