Ready-to-use ELISA kits are available for the detection of thrombospondin-4, an alias of the protein, thrombospondin 4. The official gene symbol is THBS4. The protein, with a mass of 105.9 kDa and length of 961 residues, is reported to be secreted. It is a member of the Thrombospondin family and may be known by other names, including: TSP4, and TSP-4.