after chondroitinase treatment of a proteoglycan fraction that contained 62 % chondroitin sulfate and 21 % heparan sulfate ( eluted from lipoprotein lipase with 0.4 m nacl ) , the charge and density of a portion of the heparan sulfate-containing proteoglycans decreased significantly .
C0033692
proteoglycan
C0062503
heparan sulfate