In his letter Crick further clarified his charges that Rich had used details of Aaron Klug's model of transfer RNA without proper acknowledgement. Rich and Klug were in a competitive race first to make crystals of phenylalanine transfer RNA of yeast for X-ray diffraction studies, then to deduce its structure from the X-ray data. In this debate between two of his long-time collaborators, Crick saw himself as arbiter and as guardian of the professional ethics of scientists.
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