the ability of cns endothelial cells to form a blood-brain barrier is not intrinsic to these cells but instead is induced by the cns environment : stewart and wiley demonstrated that when avascular tissue from 3-day-old quail brain is transplanted into the coelomic cavity of chick embryos , the chick endothelial cells that vascularize the quail brain grafts form a competent blood-brain barrier ;
C0014257
endothelial
C0225336
endothelial cells