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http://mbe.oxfordjournals.org/content/27/6/1348.full.pdf+html (Publisher version)
1944229_Suppl.pdf (Supplementary material), 4MB
Remmert, M., Biegert, A., Linke, D., Lupas, A. N., & Soeding, J. (2010). Evolution of outer membrane beta-barrels from an ancestral beta beta hairpin. Molecular Biology and Evolution, 27(6), 1348-1358. doi:10.1093/molbev/msq017.