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This article, written during McClintock's very active period of research on the breakage-fusion-bridge (BFB) cycle, addressed some specific questions regarding the necessary conditions under which BFB occurred.
Periodical:
Proceedings of the National Academy of Sciences of the United States of America
Periodical. McClintock, Barbara. "The Fusion of Broken Ends of Chromosomes Following Nuclear Fusion." Proceedings of the National Academy of Sciences of the United States of America 28, (1942): 458-463. Article. 6 Images.. Proceedings of the National Academy of Sciences of the United States of America