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MS analysis of [14C]et-eEF-1A tryptic peptides. MALDI-MS of concentrated HPLC fractions from two peaks of the [14C]ethanolamine HPLC profile. A signal at m/z 2721 was detected, which corresponds to the predicted mass of tryptic peptide amino acids 279 to 301 covalently bound to one PGE molecule. The signal for peptide 279 to 301 plus PGE moiety was detected from two separate sample preparations.
