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Karlin S, McGregor J.Karlin S, et al.Proc Natl Acad Sci U S A. 1972 Dec;69(12):3611-4. doi: 10.1073/pnas.69.12.3611.Proc Natl Acad Sci U S A. 1972.PMID: 4509322Free PMC article.
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