Fig. 1. The bab locus consists of two genes. (A) Molecular map with the center line representing the genomic DNA. NotI (N) and EcoRI sites (vertical lines) and the P-element insertion sites of babA128, babP and babA30 are indicated. The babP insertion point is defined as 0 on the map, the entire locus covers approximately 130 kb of DNA. The positions of the cosmid and lambda fragments of the genomic walk are shown at the top. A 412 transposable element is located in intron 1 of bab1. At the bottom are two overlapping deficiencies that each have one breakpoint within the bab locus. White regions represent deleted sequences, black regions represent DNA still present, and the deletion breakpoints are within the dashed regions. (B) Structure of the bab1 and bab2 transcripts. Untranslated regions (open boxes), exons (black boxes) and positions and sizes of introns are shown. The BTB domain and BabCD-encoding regions are also indicated.
