Figure 1
From: Transcriptional regulation and spatial interactions of head-to-head genes
The definition of head to head (H2H) gene organization and intra/inter-H2H pairs. (A) Head to head (H2H) gene organization. The region between the two transcription start sites is called a bidirectional promoter and the region between the ends of two genes is an H2H block. (B) Intra-H2H pairs and an inter-H2H pair. An inter-H2H pair involves two intra-H2H gene pairs.