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Prevalence of cataracts of grade 2 (vision impairing) as a function of time after exposure to 4 Gy in wild-type mice and in animals homozygous or heterozygous for the ATM gene. The heterozygous animals develop grade 2 (vision impairing) cataracts about 10 weeks earlier than wild-type animals. The vertical bars are standard errors, calculated by using Greenwood's formula (15).
