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Babity JM, Armstrong JN, Plumier JC, Currie RW, Robertson HA.Babity JM, et al. Among authors: armstrong jn.Proc Natl Acad Sci U S A. 1997 Mar 18;94(6):2638-41. doi: 10.1073/pnas.94.6.2638.Proc Natl Acad Sci U S A. 1997.PMID: 9122248Free PMC article.