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Intricate knots in proteins: Function and evolution.
Virnau P, Mirny LA, Kardar M. Virnau P, et al. PLoS Comput Biol. 2006 Sep 15;2(9):e122. doi: 10.1371/journal.pcbi.0020122. Epub 2006 Jul 28. PLoS Comput Biol. 2006. PMID: 16978047 Free PMC article.