Ready-to-use ELISA kits are available for the detection of intercellular adhesion molecule 4, Landsteiner-Wiener blood group, an alias of the protein, intercellular adhesion molecule 4 (Landsteiner-Wiener blood group). The official gene symbol is ICAM4. The protein, with a mass of 29.3 kDa and length of 271 residues, is reported to be membrane-associated and secreted. It is a member of the Immunoglobulin superfamily, ICAM family and may be known by other names, including: CD242, intercellular adhesion molecule 4 (LW blood group), Landsteiner-Wiener blood group antigen a, LW antigen a, CD242 antigen, and intercellular adhesion molecule 4.