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The isoforms Iso-2, Iso-3, and Iso-4 of Escherichia coli-derived recombinant human interferon alpha-2b (rhIFN α-2b), generated by posttranslational modifications of the protein during fermentation, present a major problem in terms of purification and the yield of the drug substance. We report here the structural characterization of these isoforms by mass spectrometry (MS) methods. An extensive MS...
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