Heatmap of TBX3 ChIP-seq signals and histone modification ChIP-seq signals in a 4 kb window centered on all TBX3 peaks in PFG, HE, and HEP and clustered based on the presence of H3K4me1/H3K4me3 signal. Cluster CI = H3K4me3+at one of the time points, cluster CII = H3K4me1+and H3K4me3at one of the time points, and cluster CIII = other regions.