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Metzger AK, Sheffield VC, Duyk G, Daneshvar L, Edwards MS, Cogen PH.Metzger AK, et al. Among authors: cogen ph.Proc Natl Acad Sci U S A. 1991 Sep 1;88(17):7825-9. doi: 10.1073/pnas.88.17.7825.Proc Natl Acad Sci U S A. 1991.PMID: 1679237Free PMC article.