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nESI-FTICR mass spectra of immobilized pronase digests of RNase B with 30 minutes of incubation (upper panel) and immobilized pronase digests of κ-CN with 120 minutes of incubation (lower panel). The digests using 1 mg, 5 mg, or 10 mg of PE are shown. Well known glycopeptides are labeled with closed triangles.
