Regulation of R-SUPs and TIS region peaks on genes encoding C4 enzymes. A, H3K9ac profile on the ME gene at the leaf base and blade. Positions are relative to the TIS in base pairs. Red and green dots represent mapped forward and reverse ChIP-Seq reads. The black line represents previously obtained ChIP-qPCR data from the mature leaf (Heimann et al., 2013). Arrows represent high and low transcript levels. Tx, Transcription. B, H3K9ac fold changes between leaf base and blade for R-SUPs and TIS region peaks on genes encoding C4 enzymes. PEPCK, Phosphenolpyruvate carboxykinase; PPDK, pyruvate-inorganic phosphate-dikinase.