2.6.1.5	additional information	no measurable amount of fucose, mannose, galactose, N-acetylglucose, N-acetylgalactose nor sialic acid	640104	
2.6.1.5	additional information	not a glycoprotein	640114, 640118	
2.6.1.5	proteolytic modification	liver isoform I is converted into functional lower molecular weight isoenzymes by a lysosomal convertase	30141