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Horn SJ, Sikorski P, Cederkvist JB, Vaaje-Kolstad G, Sørlie M, Synstad B, Vriend G, Vårum KM, Eijsink VG.Horn SJ, et al.Proc Natl Acad Sci U S A. 2006 Nov 28;103(48):18089-94. doi: 10.1073/pnas.0608909103. Epub 2006 Nov 20.Proc Natl Acad Sci U S A. 2006.PMID: 17116887Free PMC article.