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Kopen GC, Prockop DJ, Phinney DG.Kopen GC, et al. Among authors: phinney dg.Proc Natl Acad Sci U S A. 1999 Sep 14;96(19):10711-6. doi: 10.1073/pnas.96.19.10711.Proc Natl Acad Sci U S A. 1999.PMID: 10485891Free PMC article.