Background Phosphatidylserine (PS) exposed on apoptotic cells promotes immune clearance of dead cells without inducing inflammation. Conversely. PS exposure on live tumor cells promotes an immunosuppressive tumor microenvironment that hinders antitumor immune responses. After confirming elevated PS levels in various tumor cell lines and cancer tissues. https://www.roneverhart.com/MagnaFlow-2009-2011-Buick-Lucerne-OEM-Grade-Federal-EPA-Compliant-Direct-Fit-Catalytic-Converter/