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SDS–PAGE analysis of the native trimodular type II SdbA cohesin–DocX complex crystal composition. Lane 1, molecular-weight markers (kDa); lane 2, native complex crystal; lane 3, purified recombinant SdbA type II cohesin module; lane 4, purified recombinant DocX. The small differences between the molecular weights of the complex components and the individual proteins can be attributed to the different buffer conditions of the samples.
