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pt-PDB does not increase the proportion of side population (SP) cells. Cells were stained using Hoechst 33342. Verapamil was used to prevent the efflux of Hoechst 33342. The side population was analyzed using flow cytometry. Side populations in the flow chart were placed using pentagon gates. *P < 0.05, **P < 0.01, student t-test. Means ± S.D., n = 3.
