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Trithorax group proteins methylate lysine 4 of histone3 (H3K4) at active gene promoters.MLL5 protein,a member of the Trithorax protein family,has been implicated in the control of the cell cycle progression;however,the underlying molecular mechanism(s) have not been fully determined.In this study,we found that the MLL5 protein can associate with the cell cycle regulator "host cell factor" (HCF-1).