H3K4 methylation profiles of genes with different transcript levels. Genes were sorted into quintiles according to their transcript levels. These sets are indicated by the different colors shown in the insert box at the top of the Figure, with yellow (Q5) representing the 20% of genes with the most abundant transcripts. Total H3 or the type of H3K4 methylation measured is indicated above each graph. The y-axis of each graph shows the amount of H3 or H3K4 methylation after normalization (using the input DNA coverage profile) as measured by the number of times that region was detected by sequencing (Average Coverage). The x-axis shows the gene position in bp relative to either the transcription start site (TSS on left side of the Figure) or stop codon (on right side of the Figure) of the genes.