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Amino acid residues Ser-321 and Ser-328 of mCx37 are phosphorylated in Rin cells. Representative MS/MS spectra identifying phosphorylation at residue 321 (A) and residue 328 (B). The observed b-fragment (N-terminal) and y-fragment (C-terminal) ions allowed unambiguous localization of phosphorylation at S321 (A) and S328 (B), respectively.
