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Zidar DA, Violin JD, Whalen EJ, Lefkowitz RJ.Zidar DA, et al. Among authors: violin jd.Proc Natl Acad Sci U S A. 2009 Jun 16;106(24):9649-54. doi: 10.1073/pnas.0904361106. Epub 2009 Jun 2.Proc Natl Acad Sci U S A. 2009.PMID: 19497875Free PMC article.