Figure 1.

Diagram of the structure of the D. melanogaster blw gene. The blw gene is located on Chr2R:22,799,099…22,802,180 [+] and generates a single transcript composed of a 5′-UTR (gray box), four exons (blue boxes) and a 3′-UTR (gray arrow) (Flybase.org). The two SNPs are located 150 bp [G/T] and 188 bp [A/G] upstream of the blw transcriptional start site (gray box). The location of PCR primers used to generate the blw-promoter or blw-cDNA are indicated by red arrows.