During her 1954 visit to the United States, Franklin met or renewed acquaintance with many virus researchers, who were able to send samples of their virus material and brainstorm with her on her x-ray diffraction findings. Heinz Fraenkel-Conrat at the UC Berkeley Virus Laboratory was especially helpful, sending a variety of heavy-atom substituted TMV preparations. In this letter, Franklin requested some unsubstituted TMV protein to compare with the mercury-substituted samples he sent previously, and also asked if it would be possible to work with him for a few weeks during her upcoming summer visit.
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