Fig. 7. The distal cis-regulatory region of Xath5 alone is sufficient to promote transgene expression in the developing retina. (A) A PstI fragment that lacks the conserved proximal region promotes retinal transgene expression when coupled to either the pG1X5-TATAA basal promoter (pG1X5 distal + TATAA) or to the Fos basal promoter (pG1X5 distal + Fos). (B) Fluorescent image of a stage 30 pG1X5distal+TATAA transgenic embryo showing expression of the transgene in the retina.