Unsupervised clustering of highly accessible regions. Catch clustering analysis of highly accessible regions in proliferating NB4 cells based on profiles of H2A.Z, H2A.Zac, H3ac, p300, H3K4me3, RNAPII, H3K4me1, H3K27me3, H3K9me3, H4K20me3, and DNA methylation. The plots represent the average number of tag counts in 20-bp bins over 5-kb windows for each epigenetic mark in all clusters. Only the relevant epigenetic marks are shown in each cluster profile. Gene Ontology (GO) and P value were calculated using the online web tool “DAVID”:Database for Annotation, Visualization, and Integrated Discovery.