Effect of ray cartilage glycosaminoglycans(RCG)on the expression of MMP-9 in Lewis lung carcinoma The Stimulation Effect of Huangqi Injection on the Synthesis of Glycosaminoglycan(GAG) of Embryo Chicken Femora in Vitro Prospect of holothurian glycosaminoglycan in tumor metastasis treatment Prospect of holothurian glycosaminoglycan in tumor metastasis treatment Isolation, purification, and biological activities of ray cartilage glycosaminoglycans