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Merkel TJ, Perera PY, Kelly VK, Verma A, Llewellyn ZN, Waldmann TA, Mosca JD, Perera LP.Merkel TJ, et al. Among authors: verma a.Proc Natl Acad Sci U S A. 2010 Oct 19;107(42):18091-6. doi: 10.1073/pnas.1013083107. Epub 2010 Oct 4.Proc Natl Acad Sci U S A. 2010.PMID: 20921397Free PMC article.