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SDS–12% PAGE of purified caseinolytic protease produced by Y. ruckeri. Protein (∼7.2 μg) pooled at the DEAE-Sephacel purification step was gel loaded and, after electrophoresis, stained with Coomassie brilliant blue R-250. Protein molecular mass markers (expressed in kilodaltons) are indicated on the left. Lane 1, Purified 47-kDa protein.
