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Colby C, Chamberlin MJ.Colby C, et al.Proc Natl Acad Sci U S A. 1969 May;63(1):160-7. doi: 10.1073/pnas.63.1.160.Proc Natl Acad Sci U S A. 1969.PMID: 5257961Free PMC article.
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