Figure 7. Vsx1 knock-in reporter gene expression at embryonic day 11.5. X-gal staining of wild type (A) and Vsx1^{τLacZ/τLacZ} (B-D) mouse embryos embryonic day 11.5. Xgal staining is detected in the developing hindbrain (arrows in B and C) and spinal cord but is not detected in the developing eye (A, B - arrowhead). D: Cross-section through the eye of the embryo from panel B shows that ocular expression is undetectable in the developing retina (r), lens (L) and corneal region (c). Scale bar in D=50 μm.