Mentors at the Rockefeller Institute had warned Peyton Rous not to waste his career fooling with “the cancer question.” Then he got the bright idea that tumors might be contagious. Rous extracted part of a sarcoma from a hen, strained out the cells and injected the remnants into another bird. The second hen also developed cancer. Something hidden inside the tumor must be causing the cancer. His culprit: a virus.
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