LY9, also known as T-lymphocyte surface Antigen Ly-9, consists of four isoforms of sizes 72.1 kDa, 70.7 kDa, 57.3 kDa, and 72 kDa and interacts with adaptor molecules as an immunomodulatory receptor and member of the SLAM family. Current research is being conducted to identify the effect of the protein on diseases and disorders such as myeloma, hepatitis, lymphoproliferative syndrome, and dysgammaglobulinemia. The protein is involved in cell adhesion pathways with SH2D1A, AP2M1, PTPN11, GRB2, and SH2D1B proteins.
