TABLE 2.

N-Glycan microheterogeneity of hepatic GGT as determined by LC/MS-MS

Relative abundance values were deduced from comparative ion intensities among glycopeptide family members. The tryptic peptides in which each glycosylation site is contained are depicted in Fig. 3. Calculated m/z values for the corresponding permethylated N-glycans identified on either hepatic GGT (a) or from the pool of liver membrane glycoproteins (b) in Fig. 5 are included for reference. For abbreviations, see Table 1.