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Hackel BJ, Neil JR, White FM, Wittrup KD.Hackel BJ, et al.Protein Eng Des Sel. 2012 Feb;25(2):47-57. doi: 10.1093/protein/gzr056. Epub 2011 Dec 9.Protein Eng Des Sel. 2012.PMID: 22160867Free PMC article.