3.4.21.B39	glycoprotein	-	
3.4.21.B39	glycoprotein	N-glycosylated	
3.4.21.B39	glycoprotein	4 potential N-glycosylation sites at amino acid residues positions 69, 173, 208, and 252	
3.4.21.B39	glycoprotein	four N-glycosylation sites	
3.4.21.B39	proteolytic modification	can be processed to active enzyme from inactive precursor by trypsin