Ready-to-use ELISA kits are available for the detection of YKL39, an alias of the protein, chitinase 3 like 2. The official gene symbol is CHI3L2. The protein, with a mass of 43.5 kDa and length of 390 residues, is reported to be secreted. It is a member of the Glycosyl hydrolase 18 family and may be known by other names, including: YKL-39, CHIL2, chondrocyte protein 39, and chitinase-3-like protein 2.