Illumination of Salmonella typhimurium in the presence of neutral red (3-amino-7-dimethylamino-2-methylphenazine hydrochloride) results in mutations of the base substitution type.

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This study was supported by Grant NO1-CP-33395 from the Division of Cancer Cause and Prevention, National Cancer Institute, and Grant AI-11470 from the National Institute of Allergy and Infectious Diseases.

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