Fig. 2.

Confocal images of key BBB markers stained in human cerebral cortex at mid-gestation tissue sections (from [126]). A, B Occludin and claudin-5 display clear junctional distributions with individual endothelial cells wrapping around to form junctions with themselves and neighboring cells. C, D GLUT-1 and P-gp, critical nutrient and efflux transporters, display uniform expression