Table 1 Proteins and the corresponding peptides identified in unlabeled protein extract (¹⁴N extract) and ¹⁵N labeled extract (¹⁵N extract) in two consecutive database searches without (¹⁴N search) and with (¹⁵N search) ¹⁵N as a fixed modification.

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