H3K9me3 p300 H3K27me1 H3 siControl HDAC1 Nkx_WT (E9) H3K4me1 siNkx2-5 Raver1 Whsc1 H3K27me3 H3K4me3 H3S28P Brg1 RNAPII-S5P H3K27ac HDAC2 H3K9me1 siGata4 Tbx5 RNAPII-S2P H3K36me3 Gata4 H3K36me1 Nkx2-5 OGT Matr3 siXrn2 WT siTbx5 Input Nkx_KO (E9)