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Purification of native 34- to 36-kDa protein from nondenatured PAGE. (A) Supernatant of S. chromogenes 690LR was concentrated 300-fold and separated on 8% nondenatured PAGE gels. The dominant band was easy to recognize. (B) The dominant band was cut and eluted from the gel, and the purity of the eluted protein was checked by SDS–12% PAGE.
