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Chip electrophoresis analysis of residual impurities on MabSelect SuRe after cleaning. The Caliper software generates virtual slab gels (left) and electropherograms (right). Low intensity lane in the virtual slab gel, and corresponding electropherogram, representing the most efficient CIP protocol in this figure, are highlighted. The main protein impurity on the fouled MabSelect SuRe resin was mAb; the large size molecular peak in B5 is most likely un-reduced antibody.
