H2BC21 and prostate carcinoma: H2B regained acetylation on multiple lysine residues, phosphorylation on Thr19, and methylation on Lys23 and Lys43 in the DU-145 cells after sodium butyrate treatment.<h4>Conclusions</h4>The histone H2B of DU-145 prostate cancer cells are hypoacetylated, hypomethylated, and dephosphorylated.