3.1.1.41	proteolytic modification	enzyme is produced as a preproenzyme and processed rapidly to the mature enzyme	
3.1.1.41	proteolytic modification	preprotein is cleaved to the mature enzyme	
3.1.1.41	side-chain modification	N-linked sugar content is about 21% by weight	
3.1.1.41	side-chain modification	glycoprotein, sugar moieties may play a role in stabilizing the native structure of the enzyme