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There remains great controversy as to whether mouse mammary tumor virus (MMTV), the etiological agent of mammary cancer in mice, or a closely related human retrovirus, plays a role in the development of breast cancer in humans. On one hand, retroviruses such as human T‐cell lymphotropic virus and human immunodeficiency virus (HIV) are known causative agents of cancer (in the case of HIV, albeit, indirectly),...
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