Table 4. Identification by mass spectrometry of O-glycans released from human platelet GPIbα.

RT (min)a	Massb	m/zc	Volume	% Total	Compositiond
13.818	676.259	677.264	55954	0.1	1-1-0-1
15.621	896.351	897.355	66130	0.2	2-2-1-0
21.22	1041.385	1042.393	1109306	2.9	2-2-0-1
21.423	1058.403	1059.408	34603	0.1	3-2-1-0
22.534	1042.406	1043.414	86869	0.2	2-2-2-0
24.62	896.34	897.357	34603	0.1	3-2-1-0
24.641	1187.442	594.729	995826	2.6	2-2-1-1
24.894	1041.386	1042.393	892163	2.3	2-2-0-1
24.913	750.287	751.296	321269	0.8	2-2-0-0
28.375	1332.473	667.248	202429	0.5	2-2-0-2
29.585	1332.482	667.249	33180240	86.0	2-2-0-2
31.03	1697.612	849.818	112008	0.3	3-3-0-2
32.243	1332.49	667.253	224937	0.6	2-2-0-2
34.9	1697.618	849.815	1199390	3.1	3-3-0-2
34.904	1041.396	1042.402	66130	0.2	2-2-0-1

^aRetention time

^bDaltons

^cPrecursor ion mass to charge ratio

^dHex-HexNAc-Fuc-NeuAc