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Background: Histone modification is one of the key epigenetic regulation mechanisms which plays a critical role in various biological processes.In Saccharomyces cerevisiae, the histones H3 and H4 gene are encoded by two copy, named HHT1-HHF1 and HHT2-HHF2.Specific sites of histone acetylation, methylation and other modifications have a important biological significance to eukaryotic DNA replication.