Quercetin in 40% v/v DMSO/PBS was injected intraperitoneally (25mg/kg/day) for two months (B, Quercetin treated WT mice; D, Quercetin treated DKO mice). Equivalent volumes of 40% v/v DMSO/PBS were delivered intraperitoneally to the control vehicle groups (A, WT mice; C, DKO mice). Retinal lesions could be seen in the control and quercetin treated DKO mice (C&D, arrows). (n ≥ 19).