Table 2.

Six bovine fetuin tryptic peptides that were selected for peptide carbamylation analysis.

No.	Peptide sequencea	Unmodified peakb	Carbamylated peak
1	T*PIVGQPSIPGGPVR	√	√
2	V*VHAVEVALATFNAESNGSYLQLVEISR	√	√
3	Q*DGQFSVLFTK*	√	√
4	A*QFVPLPVSVSVEFAVAATDCIAK*	√	√
5	G*SVIQK*ALGGEDVR	-	-
6	H*TLNQIDSVK*VWPR	-	-

^a“*” highlighted the amino acid residues that can be carbamylated in urea solution.

^b“^√” represents the unmodified peptides or carbamylated peptide of fetuin were detected by MALDI-TOF-MS. “^-” represents the unmodified peptides or carbamylated peptide of fetuin were not detected.