these cultures synthesized tissue-bound and medium-released ( `` '' excreted '' '' ) glycosaminoglycans ( gags ) , as evidenced by the incorporation of 14c-glucosamine and enzymatic characterization of these labelled gags ( hyaluronic acid , heparan sulphate , chondroitin sulphate , dermatan sulphate ) .
C0017973
d ga
C0019143
, hepar