Table 2.

Determination of three O-glycopeptides of HPX in serum samples of four healthy volunteers with and without HPX protein enrichment.

	Average normalized area		RSD of normalized area (%)
	isolated HPX	HPX in serum	isolated HPX	HPX in serum
Sample 1 (843)	82.71	126.93	1.79	12.45
Sample 2 (843)	73.83	116.76	4.19	12.97
Sample 3 (843)	80.15	109.50	9.87	7.17
Sample 4 (843)	73.23	106.39	2.07	3.95
Sample 1 (770)	20.58	19.06	1.57	1.29
Sample 2 (770)	15.16	24.81	6.91	6.38
Sample 3 (770)	15.94	18.00	0.15	0.63
Sample 4 (770)	16.74	20.88	1.79	7.11
Sample 1 (1007)	6.23	5.09	10.47	15.50
Sample 2 (1007)	5.09	3.62	5.44	1.05
Sample 3 (1007)	4.29	4.15	7.30	10.12
Sample 4 (1007)	4.42	4.28	19.66	12.08