Differential histone 3 lysine 27 acetylation in Tfh and Teff cells. Differentially H3K27 acetylated enhancers in Tfh and Teff cell chromatin were identified. (A) The signal density of H3K27Ac was plotted relative to the H3K4me1 peak. (A) The average signal over all differentially acetylated enhancers in Tfh and Teff cells is shown. (B) The signal for each differentially acetylated enhancer in both cell types.