Figure 5.
LacZ expression in transgenic mice containing 0.3-kb roundabout 4 (Robo4) proximal promoter. A, Schematic of the wild-type (WT) and deletant (DEL) hypoxanthine phosphoribosyltransferase (Hprt)-targeted alleles. The 3-kb or 0.3-kb human Robo4 promoter, LacZ cDNA, and SV40 polyadenylation signal upstream of the Hprt gene are indicated. B and C, Organs (brain, lung, heart, and diaphragm) were harvested from WT and DEL mice and processed for whole mount and section staining with X-Gal. Arrows indicate the LacZ-expressing endothelial cells in blood vessels of DEL mice.