lacZ gene expression is driven by 700bp rho promoter fragment with two synthetic sna binding sites, one at each end. Most proximal sna binding site is positioned 195bp from start of lacZ transcription and 50bp from nearest dl binding site.

Construct: w gene expression is driven by 700bp rho promoter fragment with two synthetic sna binding sites, one at each end. Most proximal sna binding site is positioned 550bp from start of w transcription and 50bp from nearest dl binding site.