pgii is very similar in shape to the small cartilage chondroitin sulphate proteoglycan , whereas pgi somewhat resembles the large cartilage chondroitin sulphate proteoglycan , although with many fewer glycosaminoglycan side chains , and probably only one globular region as opposed to two in the cartilage proteoglycan .
C0033689
chondroitin sulphate
C0033692
proteoglycan