Table 1.

Frequency of cation-modified peptides within HCVcoreAg in 19 blood serum samples positive for HCV RNA (by PCR).

Amino acid	Amino acid residues	m/z	Frequency peptide-cation
			Na+	K+	Na2CL	K2CL
RGPRLGVR	40–47	910,5				2
ATRKTSER	48–55	948,5		4
GRRQPIPK	60–67	951,5			2
TSERSQPR	52–59	960,4		5
RQPIPKAR	62–69	965,6	6			1
KTNRNTNR	42–47	1003,6			5
MSTNPKPQK	41–47	1030,5	3
GPRLGVRATR	41–50	1082,6	5
KTSERSQPR	51–59	1088,6				1
MSTNPKPQKK	41–48	1158,6			1
TSERSQPRGR	52–61	1173,6		3	4	18
GSRPSWGPTDPR	102–113	1312,7		1	1
QPIPKARQPEGR	63–74	1376,7				5
GSRPSWGPTDPRR	102–114	1468,7	11
MSTNPKPQKKTNR	41–51	1529,8	1
GSRPSWGPTDPRRR	102–115	1624,8	11
FPGGGQIVGGVYLLPR	24–39	1629,9			3	2
FPGGGQIVGGVYLLPRR	24–40	1786,0	6	2		6