Researchers trying to find what causes a normal cell to become cancerous reported a significant step last week. A high-powered team of six investigators from the National Institutes of Health and Manhattan's Sloan-Kettering Institute announced that they had taken a virus that causes cancer in laboratory animals and had extracted the nucleic acid from the submicroscopic particles (only 1/100,000 mm. in diameter). This nucleic acid, when injected into test-tube growths of normal mouse cells, made them behave abnormally, as in cancer. The resulting cells, injected into hamsters, caused cancer every time. More strikingly, so did an injection of the nucleic acid...
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