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(a) UV chromatogram of Neupogen® (black trace; analysis performed 25 weeks after end-of-shelf-life, red trace analysis performed 9 weeks before end-of-shelf-life, stored at 5 ± 3 °C) and filgrastim Sandoz development samples (green and blue traces, stored for 34 weeks at 5 ± 3 °C). (b) HCD spectrum of variant peak eluting at 27.2 min and (c) HCD spectrum of variant eluting at 26.8 min
