Uberon definition : Cell layer consisting of lining cells that separates the central nervous system and
the bloodstream. The BBB may consist of endothelial cells or glial cells. An endothelial
barrier may have arisen independently several times during evolution. In bichir and
lungfish the barrier is formed by brain endothelial cells, while in sturgeon it is
formed by a complex perivascular glial sheath, but with no detectable tight junctions.;
Cell layer consisting of lining cells that separates the central nervous system and
the bloodstream. The BBB may consist of endothelial cells or glial cells. An endothelial
barrier may have arisen independently several times during evolution. In bichir and
lungfish the barrier is formed by brain endothelial cells, while in sturgeon it is
formed by a complex perivascular glial sheath, but with no detectable tight junctions.