mortality/aging
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• 10 viable heterozygous females were found in an interspecies cross with Mus spretus compared to 31 wild-type females from the same cross
• only 1 viable female was found when a backcross of the F1 heterozygous hybrid females to C57BL/6 was performed
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vision/eye
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• 3 month old hybrid mutant females show no signs of photoreceptor loss unlike heterozygous females on a pure Mus musculus background
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