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SDS-PAGE of homogeneous rhG-CSF. SDS-PAGE (12%) analysis of purified rhG-CSF showing a single protein band. Lane 1: Protein molecular mass markers (BenchMark™ Protein Ladder, Invitrogen), lane 2: homogeneous rhG-CSF (18.8 kDa) after elution from a cation exchange column, lane 3: reference standard. Lanes 2 and 3 contain 1.5 μg of total protein each.
