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Purification and crystallization of σJ. (a) 12% silver-stained SDS–PAGE. Lane 1, Bio-Rad dual colour protein markers (molecular masses are labelled in kDa). Lane 2, an analysis of σJ crystals suggests the crystallized species to be full length. (b) Tetragonal crystals of σJ. (c) A representative diffraction image for crystals of σJ.
