There are a number of ELISA Kits available for the measurement of collagen type XIX alpha 1, another term for the human protein, collagen type XIX alpha 1 chain. Other synonyms may include: collagen alpha-1(XIX) chain, a1 chain of type XIX collagen, collagen XIX alpha-1 polypeptide, collagen alpha 1 (Y) chain, COL9A1L, and D6S228E. It is encoded by the COL19A1 gene to yield a protein 1142 amino acids in length and 115.2 kDa in size. The protein is categorized into the Fibril-associated collagens with interrupted helices (FACIT) family.