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Cell cycle alterations following treatment with different demethylation agents in (A and C) Saos-2 and (B and D) MG63 cells. Data are expressed as mean ± standard deviation. *P<0.05 and **P<0.01 vs. control (Con). Aza, 5-Aza-2-deoxycytidine; PBA, 4-phenylbutyric acid.
