Distribution and enrichment of H2A.Z in different gene regions. (a–c) Mapping of peaks representing H2A.Z occupancy on a genome-wide scale relative to RefSeq mouse genes. “Promoter” and “downstream” are defined as 2 kb of 5′ or 3′ flanking regions. The “intergenic” region refers to all locations other than the promoter, 5′UTR, CDS, intron, 3′UTR, or “downstream” (d). Relative enrichment of H2A.Z peaks in gene elements defined as (number of ChIP sequencing peaks in one region/total number of ChIP sequencing peaks in genome)/(number of whole genome bases in one region/total number of whole genome bases).