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Attenuated retinal vessels in ENU-induced r18 mutant mice. (A–C) Fundus photos of 2.5-month-old heterozygous and homozygous r18 mutant littermates. Only the homozygous r18 mutant mouse shows attenuated retinal vessels (B), and some homozygous mutant mice occasionally develop retinal hemorrhage (C, indicated by an arrow).
