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Phosphopeptide purification using Ga3+ activated ZipTipMC Pipette Tips. A: 1 μL of dilution 1. B: 1 μL of dilution 1 in mixture with BSA digest in excess. C: 1 μL of dilution 2. D: 1 μL of dilution 2 in mixture with BSA digest in excess. Phosphopeptides are annotated with p. PDGF-r at m/z 1406.6, CaM kinase II substrate at m/z 1438.6, β-casein peptides at m/z 2060.8 and 3122.3.
