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Blood-retinal-barrier (BRB). Generalized schematic of the mammalian BRB, showing retinal vessels, some species like zebrafish, chicken and rabbit may have different vascular architecture. Endothelial cells and associated pericytes that line the deep, intermediate, and superficial vascular plexi make up the inner BRB (iBRB). The RPE is part of the outer BRB (oBRB) that prevents blood-borne factors from entering the retina from the choroidal vessels.
