Fig. 2From: 13C15N: glucagon-based novel isotope dilution mass spectrometry method for measurement of glucagon metabolism in humansRepresentative mass spectrum showing targeted wide SIM scan (869–881) MS1 precursor ions for light glucagon, IS (F22 glucagon), FF glucagon and FFLA glucagon (A). Representative PRM scan showing abundant b-ions (b253+, b263+ and b273+) (B). Inset shows respective b ions for endogenous glucagon, F22 glucagon (spike-in standard), FF glucagon and FFLA glucagonBack to article page