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A mass spectrometry-based method was developed for selective detection of FP-biotinylated peptides in complex mixtures. Mixtures of peptides, at the low-picomole level, were analyzed by liquid chromatography and positive ion, nanospray, triple quadrupole, linear ion trap mass spectrometry. Peptides were fragmented by collision-activated dissociation in the mass spectrometer. The free FP-biotin and...
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