PROS1 and Alzheimer disease: Among these 26 proteins, only one protein, fetuin‐B (FETUB), had an elevated abundance in non‐AD CSF, while 25 proteins were elevated in AD CSF including tau, glycolysis‐related proteins, 14‐3‐3 proteins, protein/nucleic acid deglycase DJ‐1 (PARK7), superoxide dismutase 1 (SOD1), fatty acid‐binding protein 3 (FABP3) and hypoxanthine‐guanine phosphoribosyltransferase (HPRT1).