Epithelial transport: As mentioned above, RPE compose the outer blood–retinal barrier, the epithelia has tight junctions between the lateral surfaces and implies an isolation of the inner retina from the systemic influences.
ˌɛpɪθˈɛlɪəl tɹˈænspoːɹt: æz mˈɛnʃənd əbˈʌv, ˌɑːɹpˌiːˈiː kəmpˈoʊz ðɪ ˈaʊɾɚ blˈʌd ɹˈɛtɪnəl bˈæɹiɚ, ðɪ ˌɛpɪθˈiːliə hɐz tˈaɪt dʒˈʌŋkʃənz bᵻtwˌiːn ðə lˈæɾɚɹəl sˈɜːfɪsᵻz ænd ɪmplˈaɪz ɐn ˌaɪsəlˈeɪʃən ʌvðɪ ˈɪnɚ ɹˈɛtɪnə fɹʌmðə sɪstˈɛmɪk ˈɪnfluːənsᵻz.