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Development of a mouse mammary tumor virus-negative mouse strain: a new system for the study of mammary carcinogenesis.

ABSTRACT

All inbred strains of mice transmit one or more copies of mouse mammary tumor virus (MMTV) DNA integrated as proviral sequences. This complicates efforts to define viral-induced mammary carcinogenesis. Here we report the use of surgical nonlethal splenectomy in tissue typing mice and the development of an MMTV-negative mouse strain. The MMTV-negative strain allows study of the involvement of non-MMTV genes in mammary carcinogenesis. In addition, it can be used as a sterile background into which MMTV variants can be introduced. Through the techniques described here, mice containing single MMTV loci or specific combinations can be specially chosen and rapidly developed. In this manner, the oncogenecity of particular MMTV variants may be assessed.

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