Figure 1
From: Searching for bidirectional promoters in Arabidopsis thaliana
A sketch map of bidirectional promoter. Gene 1 and gene 2 are from the same chromosome, and gene 1 is on the reverse stand while gene 2 is on the forward one. The distance between their transcription start sites (TSSs) is not more than 1000 base pairs. Gene 1 and gene 2 are called "bidirectional genes" and "bidirectional promoter" refers to the intergenic region separating "bidirectional genes" generally.