Genomic localization of antisense transcripts mapped onto gene structures. A. Distribution of 1049 antisense transcripts mapped onto the promoters, 5'-UTRs, protein-coding regions and 3'-UTR, respectively. Red cycles indicate the CpG islands of those promoters, and the green and black boxes represent the UTRs and exons, respectively. The short lines indicate the distribution of MPSS signatures of those antisense transcripts. B. Genomic localization of 16 NATs mapped onto the CpG-island-enriched promoters of the corresponding genes. The red boxes indicate CpG islands and the vertical lines in light green indicate the location of MPSS signatures.