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ArsM7A was purified by Ni–NTA chromatography as described in Qin et al. (2009 ▶). The SDS–PAGE profile of ArsM7A is shown. Lane 1 contains molecular-weight markers (labeled in kDa). Lanes 2–5 are sequential fractions eluted with an imidazole gradient. Fractions 4 and 5 were used for crystallization trials. The arrow indicates the position of ArsM7A.
