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Bisretinoid levels ([a]: at-RAL dimer, [b]: A2PE-H2, [c]: A2-PE, [d]: total A2E) from eye cups of 3-month-old wild-type mice (black, n = 6, Abca4+/+), mice with monoallelic Abca4 mutation (blue, n = 5, Abca4+/−), and Abca4 knockout mice (red, n = 6, Abca4−/−). mAU/eye, milli absorbance units per eye. Error bars show standard deviation. **P < 0.01; ***P < 0.001.
