Abstract
Summary
1. These experiments describe a method of testing the activity of chemotherapeutic drugs against whole tumor cells and against the cell-free agent of Rous chicken sarcoma. 2. Terramycin, aureomycin, neomycin and antibiotic PA96 (Pfizer) in certain concentrations were capable of preventing the formation of tumors of Rous sarcoma when the virus was first exposed to these antibiotics prior to inoculation into susceptible young chickens.
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