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MS/MS identification of S262 phosphorylated and K267 methylated PHF-tau peptides. Spectra for PHF-tau derived peptide aa258–267 identified in a unmodified, b monomethylated (asterisks site of methylation), c Ser phosphorylated (at sign site of phosphorylation), and d doubly modified (asterisks site of methylation; at sign site of phosphorylation) forms
