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CONCLUSIONS The development of a simplified sample preparation protocol and the use of multiplexing SPLC-MS/MS have reduced sample analysis times for vitamin A and E. This method has also optimized clinical workflow through consolidation of previously independent benches. V.The PD-1/PD-L1 coinhibitory pathway has critical roles in the immune response and autoimmunity via the regulation of T cell activity. Excessive activity and high expression of this pathway suppresses the function of T cells and immunity. Recent research has indicated