Tags: Protein.
Collagen alpha-2(IX) chain is a protein that in humans is encoded by the COL9A2 gene.This gene encodes one of the three alpha chains of type IX collagen the major collagen component of hyaline cartilage. Type IX collagen a heterotrimeric molecule is usually found in tissues containing type II collagen a fibrillar collagen. This chain is unusual in that unlike the other two type IX alpha chains it contains a covalently attached glycosaminoglycan side chain.