Table 1.

Standard peptides used for peptide carbamylation assay and the peptide masses of their unmodified and carbamylated form.

Peptide	Sequencea	Unmodified mass (Da)	Carbamylated mass (Da)b
Angiotensin	D*R*VYIHPFHL	1296.68	1339.69	1382.7
Neurotensin	pyro-ELYENK*PR*R*PYIL	1672.92	1715.93	1758.94	1801.95

^a“*” highlighted the amino acid residues that can be carbamylated in urea solution. ‘Pyro-’ represents pyroglutamic acid.

^bThe masses of peptides with 1, 2 or 3 amino acid residues carbamylated (+43 Da). All masses are monoisotopic masses [M+H]⁺.