these oligosaccharides were first prepared by enzymatically depolymerizing the gags with enzymes including heparin lyase ( ec 4.2.2.7 ) , heparan sulfate lyase ( ec 4.2.2.8 ) , chondroitin abc lyase ( ec 4.2.2.4 ) , and keratan sulfate hydrolase ( ec 3.2.1.103 ) .
C0017973
gags
C0019143
heparan sulfate