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Powers WJ, Videen TO, Markham J, McGee-Minnich L, Antenor-Dorsey JV, Hershey T, Perlmutter JS.Powers WJ, et al. Among authors: markham j.Proc Natl Acad Sci U S A. 2007 Feb 20;104(8):2945-9. doi: 10.1073/pnas.0609833104. Epub 2007 Feb 13.Proc Natl Acad Sci U S A. 2007.PMID: 17299049Free PMC article.