Used in immunological research to study the AXL receptor signaling pathway in non-human primate models, particularly in inflammation, immune regulation, and viral entry mechanisms. The Fc tag enables easy detection and purification, and facilitates binding studies with ligands such as Gas6 in cell-based assays. Commonly applied in preclinical development of therapeutics targeting the TAM receptor family, helping assess target engagement and biological activity in cynomolgus and rhesus macaque systems as translational models for human diseases.