comparison of the effects of heparinase and heparitinase treatment revealed that the heparan sulfate proteoglycans of brain contain a significant proportion of relatively short n-sulfoglucosaminyl 6-o-sulfate [ or n-sulfoglucosaminyl ] ( alpha 1-4 ) iduronosyl 2-o-sulfate ( alpha 1-4 ) repeating units and that the portions of the heparan sulfate chains in the vicinity of the carbohydrate-protein linkage region are characterized by the presence of d-glucuronic acid rather than l-iduronic acid .
C0062503
heparan sulfate proteoglycans
C0019143
heparan sulfate