the proteoglycan subunit species of the lowest molecular weight contains the least chondroitin sulfate and had an amino acid composition relatively low in serine and glycine and relatively high in cysteine , methionine , and aspartic acid , almost identical to that of the hyaluronic acid-binding region of proteoglycan subunit isolated by heinegard and hascall ( heinegard , d. , and hascall , v.c . ( 1974 ) j. biol . chem . 249 , 4250-4256 ) .
C0002520
amino acid
C0017890
glycine