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Virbasius JV, Scarpulla RC.Virbasius JV, et al. Among authors: scarpulla rc.Proc Natl Acad Sci U S A. 1994 Feb 15;91(4):1309-13. doi: 10.1073/pnas.91.4.1309.Proc Natl Acad Sci U S A. 1994.PMID: 8108407Free PMC article.