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This manuscript draft addressed much of the same data included in McClintock's 1957 report to the Carnegie Institution and revealed her increasing understanding of the complexity of the action of controlling element suppressor-mutator, or Spm.
Original Repository:
The American Philosophical Society. Library. Barbara McClintock Papers
Location:
Box: 2. Folder: 3
Rights:
Reproduced with permission of the Barbara McClintock Papers, American Philosophical Society.