Figure 4
Effect of neordeletion on Cre expression. Ventral views of two E12.5 Foxn1+/ex9cre;R26R+/- embryos, x-gal stained to show Cre activity. A, Prior to deletion of the neorcassette, extensive non-specific staining was seen throughout the embryo. B, Thymus-specific expression after removal of the neorcassette. The heads have been removed from both embryos to allow visualization of the thymic primordia. Arrows indicate one of the thymic lobes. h = heart.