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The focus of this report is the change in McClintock's thinking about biochemical and physical mechanisms to explain transposition, mutation, and gene expression. These changes were developed in a series of memos to Marcus Rhoades during 1950 and introduced in an article in the "Proceedings of the National Academy of Sciences" the same year.
Periodical. McClintock, Barbara. "Mutable Loci in Maize." Carnegie Institution of Washington Yearbook 50, (1951): 174-181. Article. 8 Images.. Carnegie Institution of Washington Yearbook