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. 2011 Jan 21;6(1):e16283. doi: 10.1371/journal.pone.0016283

Figure 1. A network of interacting cis-regulatory modules control embryonic expression of abdominal-A and Abdominal-B in the Drosophila bithorax complex.

Figure 1

The abd-A and Abd-B morphogenetic (m) and regulatory (r) transcripts are indicated by leftward arrows. The regulatory regions iab-2, iab-3 and iab-4 (blue) interact with abd-A. The iab-5, iab-6, iab-7 and iab-8 regions (green) interact with Abd-B m. Each iab region is thought to contain at least one characterized enhancer (orange rectangles) capable of directing Hox gene expression in a specific embryonic parasegments (PS). The positions of the characterized Fab-6, Fab-7, Fab-8 and Mcp insulators (red ellipses), promoter targeting sequence (PTS) modules (white rectangles), promoter tethering element (PTE) (yellow rectangle) and polycomb response elements (PREs) (pink rectangles) are indicated. Numbers above line refer to kilobase positions in DNA sequence accession number: DM31961.