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Smedlund KB, Birnbaumer L, Vazquez G.Smedlund KB, et al.Proc Natl Acad Sci U S A. 2015 Apr 28;112(17):E2201-6. doi: 10.1073/pnas.1505410112. Epub 2015 Apr 13.Proc Natl Acad Sci U S A. 2015.PMID: 25870279Free PMC article.