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Calkin DE, Cohen JD, Finney MA, Thompson MP.Calkin DE, et al.Proc Natl Acad Sci U S A. 2014 Jan 14;111(2):746-51. doi: 10.1073/pnas.1315088111. Epub 2013 Dec 16.Proc Natl Acad Sci U S A. 2014.PMID: 24344292Free PMC article.
Thompson M, Dunn C, Calkin D.Thompson M, et al.Science. 2015 Nov 20;350(6263):920. doi: 10.1126/science.350.6263.920-b.Science. 2015.PMID: 26586754No abstract available.