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Reference: POSA: a user-driven, interactive multiple protein structure alignment server. Z Li, P Natarajan, Y Ye, T Hrabe, A Godzik. Nucl. Acids Res. (2014) doi: 10.1093/nar/gku394
Method reference: Multiple flexible structure alignment using partial order graphs. Yuzhen Ye and Adam Godzik. Bioinformatics, 2005 21(10):2362-2369. (color figures)
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Provide protein structures (no more than 20 structures) using one of the following methods (help):

Leave blank or use one dot(.) for un-specified chain Id, then the 1st chain will be used; To specify a space chain Id, please use two dots(..); Any space Chain Id will be renamed with a new unique alphanumeric Chain Id.