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Varki AP, Reitman ML, Kornfeld S.Varki AP, et al. Among authors: reitman ml.Proc Natl Acad Sci U S A. 1981 Dec;78(12):7773-7. doi: 10.1073/pnas.78.12.7773.Proc Natl Acad Sci U S A. 1981.PMID: 6461005Free PMC article.