TYRO3 and rheumatoid arthritis: As TAM proteins are well-known kinase receptors that are crucial for macrophage efferocytosis for the clearance of apoptotic cells [10], to investigate the profile and clinical relevance of autoantibody against Tyro3 receptor in SLE, we detected the serum levels of anti-Tyro3 IgG in patients with SLE, RA, pSS, and HCs by ELISA.