The proteoglycans containing DS chain in vivo include disaccharide proteoglycan, core proteoglycan, multifunctional proteoglycan and binding proteoglycan, etc.

　　The DS chain can be composed of different structures. For example, three different kinds of uronic acid and four different kinds of hexosamine.

　　MF701 had a molecular weight of 15,000 to 45,000 by HPLC, with an average of 35,700, and 8000 to 45,000 by PAGE, with an average of 28,000.