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Hempel AM, Cantlay S, Molle V, Wang SB, Naldrett MJ, Parker JL, Richards DM, Jung YG, Buttner MJ, Flärdh K.Hempel AM, et al. Among authors: flardh k.Proc Natl Acad Sci U S A. 2012 Aug 28;109(35):E2371-9. doi: 10.1073/pnas.1207409109. Epub 2012 Aug 6.Proc Natl Acad Sci U S A. 2012.PMID: 22869733Free PMC article.