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MS/MS profile of phosphorylated peptides of PIP2;4. A, MS/MS spectra of PIP2;4 singly phosphorylation site (ALGSFGpSFGSFR); B, MS/MS spectra of PIP2;4 singly phosphorylation site (ALGSFSFGpSFR); C, MS/MS spectra of PIP2;4 doubly phosphorylation sites (ALGSFGpSFGpSFR).
