Figure 4: Different types of overlapping genes. (a) Genes sharing the same locus on the same strand, however coding for different proteins. (b) Genes sharing promoter region. (c) Nested gene. (d) Embedded gene. (e) Genes on opposite strands with overlapping locus but no overlap in the exonic region. (f) Tail-to-tail overlap in the exonic region. (g) Head-to-head overlap involving 3’-UTRs and coding sequence. Dark (red) boxes: coding sequence; light (blue) boxes: untranslated regions; patterned (green) box: promoter region [47].