LY9 belongs to the SLAM family of immunomodulatory receptors (see SLAMF1; MIM 603492) and interacts with the adaptor molecule SAP.LY9 (Lymphocyte Antigen 9) is a Protein Coding gene. Diseases associated with LY9 include Systemic Lupus Erythematosus. Among its related pathways are Hematopoietic Stem Cell Differentiation Pathways and Lineage-specific Markers. GO annotations related to this gene include receptor activity. An important paralog of this gene is CD84.