Fig. 4

Circos plots of methylation patterns in the Populus trichocarpa genome. Tracks shown in an outward order are: Track 1 (innermost), gene; Track 2, transposable element (TE); Tracks 3–5, density plots of 5-methylcytosine (5mC) in CG contexts in primary stems (PS), transitional stems (TS), and secondary stems (SS), respectively; Tracks 6–8, density plots of 5mC in CHG contexts in PS, TS, and SS, respectively; Tracks 9–11, density plots of 5mC in CHH contexts in PS, TS, and SS, respectively