Fig. 4

Estimated gene overlaps in Gencode Release 19. a) The same strand and opposite strand overlaps at the gene level; about 19 % of genes overlap with one or more genes at the opposite strand; b) the overlaps at the nucleotide base level. On average, the estimated overlapping at the same and opposite strands are 3 % and 3.6 %, respectively, and agree well with the practical RNA-seq dataset shown in Fig. 3d