History. Holliday model of recombination.
Smith
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D020029:Base Pairing; D003434:Crossing Over, Genetic / Q000235:genetics; D004247:DNA / Q000266:history*; D005785:Gene Conversion / Q000235:genetics; D049673:History, 20th Century; D008957:Models, Genetic; D011995:Recombination, Genetic / Q000235:genetics*
D004247:DNA