Quantitative ChIP analysis of the hKCC1 core promoter region. (A) Representative amplification plots of preimmune serum and DNA from chromatin immunoprecipitated with anti-H3 and anti-H4 antibodies at the hKCC1 gene core promoter in K562 and HeLa cells. PI indicates preimmune serum. (B) The core promoter region of the hKCC1 gene is hyperacetylated by H3 and H4 in K562 and HeLa cells in chromatin immunoprecipitation assays. See text for details. Error bars indicate SD.