Direct characterization of protein complexes by electrospray ionization mass spectrometry and ion mobility analysis / Joseph A. Loo and Catherine S. Kaddis -- Softly, softly--detection of protein complexes by matrix-assisted laser desorption ionization mass spectrometry / Kevin M. Downard -- Probing protein interactions using hydrogen-deuterium exchange mass spectrometry / David D. Weis ... [et al.] -- Limited proteolysis mass spectrometry of protein complexes / Maria Monti and Piero Pucci -- Chemical cross-linking and mass spectrometry for investigation of protein-protein interactions / Andrea Sinz -- Genesis and application of radical probe mass spectrometry (RP-MS) to study protein interactions / Simin D. Maleknia and Kevin M. Downard