Bilin protein. The level and plane of the sections shown in Figure 6 is illustrated by the line drawn through the embryo shown in the upper left hand corner. The red boxes drawn over the neuroepithelium of embryos shown in and (4× magnification) indicate the orientation of the higher magnification panels (40× magnification) shown in , , , and ; the apical surface (ventricular side) of the neuroepithelial cells is shown on the right of these panels, and the basolateral, or mesenchymal side of the neuroepithelial cells is shown on the left side of the panels. Megalin is expressed exclusively on the apical side of neuroepithelial cells in wildtype embryos (; red arrows), but is expressed on both the apical (; red arrows) and the basolateral side (; purple arrowheads) of the neuroepithelium in mutants. Cubilin expression is also restricted to the apical side of neuroepithelial cells in wildtype embryos (, ; red arrows), but is misexpressed on the basolateral side of the neuroepithelium in nullizygous embryos (, ; purple arrowheads). Staining for cubilin protein is visible in the surface ectoderm of embryos (; black arrows), and discrete staining is also observed in the notochord (, ; yellow arrow). Cubilin expression is highly upregulated in the cranial mesenchyme of embryos (shown in panel ) relative to wildtype littermates, especially in the region surrounding the notochord (; yellow arrow). Staining for cubilin protein is visible in the mesothelial cells of the pericardium of wildtype (; black arrowhead) and mutant embryos (not visible in section shown in ), and although there are a few cells that stain positive for cubilin in the trabeculae of the common ventricular chamber in the wildtype embryo, cubilin expression is dramatically upregulated throughout the myocardium of the mutant (). Normal morphology of the primary head vein/cephalic extension of the anterior cardinal vein (**) and the third branchial arch artery (*) in the wildtype embryo are shown in (6C); comparable structures labeled in the mutant (6D) indicate abnormal vascular morphology. left ventricle.<p><b>Copyright information:</b></p><p>Taken from "Microarray analysis of E9.5 reduced folate carrier () knockout embryos reveals altered expression of genes in the cubilin-megalin multiligand endocytic receptor complex"</p><p>http://www.biomedcentral.com/1471-2164/9/156</p><p>BMC Genomics 2008;9():156-156.</p><p>Published online 9 Apr 2008</p><p>PMCID:PMC2383917.</p><p></p
