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etylated histone H4 and lysine 9 acetylated histone H3 showed that 7 days VPA treatment particularly enhanced histone tails acetylation. An immunoprecipitation experiment was then performed with chromatin extracted by cells grown for 7 days in the presence or the absence of VPA, applying anti-H4Ac and anti- H3K9Ac antibodies, followed by genuine time PCR to detect enrichment of precise CD34 promot