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Positive ion MALDI-TOF analysis of neutral N-glycans released from rIgAs produced in mutant CHO cell lines defective in glycan processing. The likely glycan structures are shown as a schematic and the mass of the glycans is expressed as m/z. (A) IgA1 produced in Lec2, (B) IgA2m2 produced in Lec2, (C) IgA1 produced in Lec8, (D) IgA2m2 produced in Lec8.
