GAS6 and gingivitis: Salivary levels of tyrosine-protein kinase receptor UFO (AXL), TYRO3 protein tyrosine kinase (TYRO3), Proto-oncogene tyrosine-protein kinase MER (MERTK), and growth arrest-specific protein 6 (GAS6) were quantified using a multiplex immunoassay approach.<h4>Results</h4>Salivary AXL, TYRO3, MERTK, and GAS6 levels were significantly elevated in periodontitis compared to periodontally healthy and gingivitis patients.