although the soluble proteoglycan preparation was a mixture of chondroitin sulfate proteoglycans with a different hydrodynamic size as well as a different molecular density , each subfraction of the proteoglycans contained chondroitin sulfate side chains with virtually identical molecular weight ( approximately 15,000 ) and chondroitin sulfate disaccharide composition ( high content of 4-sulfate unit ) .
C0033689
chondroitin sulfate proteoglycans
C0033692
proteoglycans