Anti-Jam4 antibodies enable researchers to detect and measure the Jam4 antigen in biological samples. This target is a reported synonym of the IGSF5 gene, which encodes immunoglobulin superfamily member 5. This protein is known to function in cell adhesion, among other biological roles. The human version of Jam4 has a canonical amino acid length of 407 residues and a protein mass of 44.6 kilodaltons. It is reported to be localized in the cell membrane of cells. Jam4 is a member of the Immunoglobulin protein superfamily.