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ARP/wARP models of CFA synthase built at 2.7 Å resolution using default parameters. Parts of the models that were not assigned to the sequence are presented in black, while other chains are shown in red and green. The models were built (a) without homology-based extension and (b) with homology-based extension. (c) The closest homologue and the MR search model (PDB entry 3hem), shown in black, superposed onto the ARP/wARP model from (b), shown in grey.
