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Zhang HY, Issberner J, Sillar KT.Zhang HY, et al.Proc Natl Acad Sci U S A. 2011 Jul 12;108(28):11674-9. doi: 10.1073/pnas.1018512108. Epub 2011 Jun 27.Proc Natl Acad Sci U S A. 2011.PMID: 21709216Free PMC article.