piRNA mapped to different ME subfamilies. (A) Proportion of piRNAs mapped to different ME families. ME families DNA, LINE, LTR, SINE, and SVA are shown. The relative proportion of the ME families in the reference genome is shown for reference. (B) Proportion of piRNAs mapped to different LTR subfamilies. Left and right charts show the proportion of piRNAs mapped to sense and antisense strand, respectively. (C) The normalized number of piRNAs mapped to LTR, LINE, SINE, and DNA class of MEs. Subfamilies are arranged by the age from oldest to youngest . LTR1 subfamily with the highest piRNA mapping density is labelled on the plot.