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Detection of isoAsp by intact HIC separation and focused peptide map. HIC of stability samples held at 40°C (A) or at 25°C (B). A214 nm trace from the focused peptide map of stability samples held at 40°C (C) or at 25°C (D). T = 0 weeks (black), T = 4 weeks (blue), T = 12 weeks (red), T = 24 weeks (green). The x-axis has been normalized to the main peak to account for normal chromatographic drift.
