the small proteoglycans obtained in the extract were fractionated by gel filtration on sepharose cl-6b , purified by ion-exchange chromatography on polyanion matrix ( fast protein liquid chromatography ) , and then separated into three major populations of chondroitin sulfate proteoglycans by chromatography on hydroxylapatite , all in the presence of 7 m urea .
C0033692
proteoglycans
C0033689
chondroitin sulfate proteoglycans