Figure 4B caption: "Expression of bxIs13 in the seam requires wild-type egl-5 gene function. The transgene is not expressed in V6.ppp or its descendants in egl-5(u202). Here, lack of expression in V6.pppp is shown."
The sequence upstream of the egl-5 gene corresponding to the transgene bxEx88 was shown to be necessary and sufficient to drive expression of a GFP reporter in the V6 lineage (Figure 2A)