Correlation between gene expression and changes in histone modifications of the most highly changed genes during erythroid differentiation. Correlation curves of the change in enrichment of a histone mark bound to a gene (late erythroblasts relative to enriched CFU-Es) plotted against the change in expression of that gene (late erythroblasts relative to enriched CFU-Es) using the set of 126 highly induced genes and 536 highly repressed genes. Ratios represented for enrichment and expression changes are in a log2 scale. Histone marks are indicated above each graph, and correlation coefficient (Pearson r) is given below each graph. Graphs with red dots represent active marks; black dots, elongation marks and Pol II; and blue, the repressive mark H3K27me3.