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Analysis of purified SlTsdA and SlTsdB + A by SDS-PAGE. 10–15 μg of SlTsdA and SlTsdB + A obtained after Strep tag affinity chromatography were loaded per lane on a 12.5% gel and stained for presence of heme. In case of SlTsdB + A, both proteins were produced simultaneously in E. coli and purified on the basis of a Strep tag attached to TsdA.
