Smith for the His-HBO1 plasmid, Dr. K. Struhl for the HA-p53 plasmid, Dr. Trouche for the HA-Tip60 plasmid and Dr. Yang for the Flag-MOZ plasmid. GRANT SUPPORT This work was supported by the National Institutes of Health grant, Dr. J. Boyes for the Flag-p300 plasmid, Dr. J. Côté for the HA-HBO1 plasmid, Dr. M ,
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