ðɪ ˌɑːɹpˌiːˈiː ɪz kəmpˈoʊzd əvə sˈɪŋɡəl lˈeɪɚɹ ʌv hˈɛksɐɡənəl sˈɛlz ðæt ɑːɹ dˈɛnsli pˈækt wɪð pˈɪɡmənt ɡɹˈænuːlz.
The RPE is composed of a single layer of hexagonal cells that are densely packed with pigment granules.