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Besson MJ, Cheramy A, Feltz P, Glowinski J.Besson MJ, et al.Proc Natl Acad Sci U S A. 1969 Mar;62(3):741-8. doi: 10.1073/pnas.62.3.741.Proc Natl Acad Sci U S A. 1969.PMID: 4389748Free PMC article.