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CIEF is a powerful separation tool utilized in the characterization and relative quantitation of therapeutic mAb charged isoforms. However, one CIEF method is not capable of separating all mAbs with high resolution and reproducibility. Optimization of sample composition and separation parameters is expected when developing a CIEF method for a specific mAb. This paper summarizes a root cause investigation into why a validated CIEF separation method for MAK33 (a type of IgG1) was no longer reproducible. In addition, this paper introduces t