Fig. 4

Read mapping to the mitochondrial genome. Coverage of the bank vole mtDNA by the RNA-Seq reads (top panel) and the distribution of the reads matching the poly(A) 3′ transcript ends (combined evidence from the two voles; bottom panel). Annotation arrows pointing right indicate RNA and protein-coding genes (PCGs) encoded by the heavy strand and left arrows PCG encoded by the light strand. In the top panel, the minimum, mean and maximum coverage values are shown in different shades of blue as calculated using a window size of 100 bp. In the bottom panel, the total number of individual reads that align to the transcript ends are shown, with those between 1 and 40 displayed by a ladder (linear scale), with any additional reads between 41 and 477 displayed as a solid bar (linear scale)