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Representative electrospray ionization tandem mass spectrometry spectra of phosphopeptides. Electrospray ionization tandem mass spectrometry spectra of three representative identified phosphotyrosine residues (pTyr138 (A and B), pTyr152 (C and D), and pTyr191 (E and F)) from tryptic (A, C, and E) and chymotryptic digested peptides (B, D, and F). The remaining spectra are available in supplemental Fig. 1.
