neoplasm
• nearly 80% of specific-pathogen free (SPF) mutant mice infected with Rauscher-like murine leukemia virus (RL-MuLV) exhibit leukemia by 150 days compared to 50% of SPF wild-type mice
• however, development of leukemia after infection with RL-MuLV occurs at the same latency and with similar incidence as in wild-type mice
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