Alu content in flanking regions of human genes (20 kilobases) and expression profiles. Groups represent the 20% most highly ('High'), least highly ('Low'), and the medium expressed genes ('Medium') for peak (top panel) and breadth (lower panel). Points for high and low groups significantly different from medium expression levels (Student's t-tests using Bonferroni correction) are represented by closed circles. Each point represents the Alu content in sliding windows of 1 kilobase (moving 200 base pairs at a time).
Urrutia et al. Genome Biology 2008 9:R25 doi:10.1186/gb-2008-9-2-r25