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ERG responses in Abca4−/−/Bco2−/− and Abca4−/− mice after one month of carotenoid supplementation. (a) Scotopic a-wave amplitudes. (b) Scotopic b-wave amplitudes. (c) Photopic a-wave amplitudes. (d) Photopic b-wave amplitudes. Mice were dark-adapted, and their scotopic and photopic ERG response were recorded (n=6 mice/group). L-lutein, Z-zeaxanthin and P-placebo chow. Data presented as mean ± SEM. The differences were not significant.
