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MALDI-TOF MS analysis of Ti-IMAC enriched β-casein and RNase B digest mixture. (A, B) Ti-IMAC enrichment in HILIC-mode and elution without fractionation. (C-E) Ti-IMAC enrichment in HILIC-mode and elution with 0.1% FA (D) and 10% ammonia (E) fractionation. (# represents phosphopeptides and * represents glycopeptides)
