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This article addressed the many new mutations McClintock was able to produce during her 1944 experiments with plant B-87. In them, she was able to produce seven or eight mutable genes that spontaneously mutated then reverted during plant growth. Prior to this, only two mutable genes had been found in maize.
Periodical. McClintock, Barbara. "Cytogenetic Studies of Maize and Neurospora." Carnegie Institution of Washington Yearbook 44, (1945): 108-112. Article. 5 Images.. Carnegie Institution of Washington Yearbook