http://download.cell.com/pdf/PIIS0092867400806741.pdf
Cell Press
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http://pdfs.semanticscholar.org/8e32/8d8aeabc780d2a94d5af9feeaea1b2477e22.pdf
pdfs.semanticscholar.org
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Elsevier
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http://core.ac.uk/download/pdf/82809384.pdf
core.ac.uk
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