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MAIV mass spectra. (I) Positive ion mode: (A) 1 pmol leucine enkephalin (molecular weight (MW) 555 Da), (B) 1 pmol MBP peptide (MW 1833 Da), and (C) 50 fmol ubiquitin (MW 8559 Da). (II) Negative ion mode: (A) ubiquitin, (B) phosphorylated peptide cholecystokinin (10–20) (MW 1332 Da), and (C) hirudin (55–65) peptide (MW 1411 Da).
