It is enclosed by the blood-retinabarrier, keeping viruses in and the immune system mostly out.
血视网膜屏障包围着眼睛，把载体限制在内的同时，几乎把免疫系统阻隔在外。
2
Objective To investigate effects of neural retina on development of the structure of outer blood retinal barrier in embryogenesis.
目的研究胚胎发育中神经视网膜对血视网膜外屏障结构形成的作用。
3
Retinal pigment epithelial (RPE) cells lie between the sensory retina and the choroids, constitute the outer blood retinal barrier and play a vital role in the retinal metabolism.