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GSK3β phosphorylation requires priming site phosphorylation. Charge-state-deconvolved mass spectra of GSK3β in vitro kinase reaction products using either non-phosphorylated (A), mono-phosphorylated (B), or triple-phosphorylated CLASP2 peptide as substrate (C). Representative spectra of three independent experiments are shown. The indicated molecular masses include the peptide FITC tag. a.u., arbitrary units.
