DNA methylation within and proximal to gene models. RPKM values of all genes with annotated UTRs were averaged over 100 bp tiled windows. Dashed lines delimit the transcribed region. The 5' and 3' UTRs shown represent the average size of these features in the P. trichocarpa genome. Windows were taken 2 kb upstream and downstream of the ends of 5' and 3' UTRs. Windows that overlapped adjacent gene models were excluded. If multiple splice variants of a gene model were annotated, only the first was used.