ðə kˌɑːmbᵻnˈeɪʃən ʌv lˈaɪt ænd ˈɑːksɪdʒən bɹˈɪŋz ˈɑːksɪdətˌɪv stɹˈɛs, ænd ˌɑːɹpˌiːˈiː hɐz mˈɛni mˈɛkənˌɪzəmz tə kˈoʊp wɪð ɪt.
The combination of light and oxygen brings oxidative stress, and RPE has many mechanisms to cope with it.