Before revision:  Here, we apply 2D-pC-MS to the analysis of intact protein ions in a standard linear ion trap mass analyzer, using the fact that the fragment-fragment correlation signals are much more specific to biomolecular sequence than 1D MS/MS signals at a given mass accuracy and resolution.
After revision:  Here, we apply 2D-PC-MS to the analysis of intact protein ions in a standard linear ion trap mass analyzer, using the fact that the fragment-fragment correlation signals are much more specific to biomolecular sequence than 1D MS/MS signals at a given mass accuracy and resolution.