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Doetsch F, García-Verdugo JM, Alvarez-Buylla A.Doetsch F, et al.Proc Natl Acad Sci U S A. 1999 Sep 28;96(20):11619-24. doi: 10.1073/pnas.96.20.11619.Proc Natl Acad Sci U S A. 1999.PMID: 10500226Free PMC article.