Proceedings of the National Academy of Sciences (2012) - Comment
pubmed: 22431642  doi: 10.1073/pnas.1117206109  issn: 1091-6490  issn: 0027-8424 

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Jennifer S. Perrin, Susanne Merz, Daniel M. Bennett, James Currie, Douglas J. Steele, Ian C. Reid, Christian Schwarzbauer