C. Arthur Knight was one of many virus researchers that Franklin visited during her 1954 trip to the United States. A colleague of Wendell Stanley, Robley Williams, and Heinz Fraenkel-Conrat, he later sent her samples of cucumber virus. In her first letter to him, she posed some detailed questions about the differences between her x-ray diffraction values for TMV composition, and the biochemical findings by the Berkeley virus lab.
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