suggested first time transduction viruses might cause cancer bang ellerman showed filterable virus could transmit chicken leukemia data largely ignored till leukemia became regarded cancerous ref name epps peyton rous reported transmission chicken sarcoma solid tumor virus thus rous became father tumor virology ref name epps ref virus later called rous sarcoma virus understood retrovirus several cancer causing retroviruses since described existence viruses infect bacteria bacteriophages first recognized
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