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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

  Proteins Peptides
  14N search 15N search 14N search 15N search
14N extract 195 1 536 2
15N extract 4 167 6 415