Proceedings of the National Academy of Sciences (2012) - Comment
pubmed: 22891338  doi: 10.1073/pnas.1117676109  issn: 1091-6490  issn: 0027-8424 

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Weidong Zhu, Quynh T. Phan, Pinmanee Boontheung, Norma V. Solis, Joseph A. Loo, Scott G. Filler