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Differential use of CBP's HAT activity by weak and strong enhancers. HeLa cells were transfected with the PRDII1, PRDII2, and PRDII4 reporters, along with expression vectors for p65, in the presence of WT CBP or GCN5 or derivatives bearing catalytic inactivating mutations in their HAT domains. Shown is the average of six independent experiments; the variability from experiment to experiment was less than 30%. The error bars indicate standard deviations.
