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Howerton CL, Bale TL.Howerton CL, et al. Among authors: bale tl.Proc Natl Acad Sci U S A. 2014 Jul 1;111(26):9639-44. doi: 10.1073/pnas.1401203111. Epub 2014 Jun 16.Proc Natl Acad Sci U S A. 2014.PMID: 24979775Free PMC article.