off peptide product ions

https://doi.org/10.1351/goldbook.09756

Protein/peptide sequencing approach using overlapping complementary information on a sequence acquired using proteolysis in bottom-up proteomic analysis by at least two different proteolytic approaches.

Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1158 (https://doi.org/10.1515/pac-2016-1120)