Attenuation of Exogenous Murine Mammary Tumor Virus Virulence in the C3H/HeJ Mouse Substrain Bearing the Lps Mutation

A major change in mammary tumor incidence (MTI) and latency has occurred in the C3H/HeJ mouse substrain maintained at The Jackson Laboratory. The average time required for 50% of the C3H/HeJ mice to develop a mammary tumor changed from 40 weeks of age to the current 61 weeks of age. This 61-week med...

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