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Hepworth MR, Daniłowicz-Luebert E, Rausch S, Metz M, Klotz C, Maurer M, Hartmann S.Hepworth MR, et al. Among authors: klotz c.Proc Natl Acad Sci U S A. 2012 Apr 24;109(17):6644-9. doi: 10.1073/pnas.1112268109. Epub 2012 Apr 9.Proc Natl Acad Sci U S A. 2012.PMID: 22493240Free PMC article.