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Table 2 Overview of the intensity ratio of 14N and 15N tryptic peptide pairs and the number of proteins identified in the two database searches.

From: Metabolic labeling of plant cell cultures with K15NO3 as a tool for quantitative analysis of proteins and metabolites

mixing ratio mean ratio ID in 14N search ID in 15N search % quantified
1:1 0.89 ± 0.2 87 53 87.4
1:4 5.69 ± 2.0 29 145 93.1
4:1 0.29 ± 0.1 149 18 75.0