1. From the Department of Biological Chemistry (H.S.C., C.I.M., R.N.C., J.E.V.E.), Division of Cardiology, Department of Medicine (V.V., P.P.R., D.A.K., J.E.V.E.), The Johns Hopkins NHLBI Proteomics Innovation Center on Heart Failure (H.S.C., V.V., D.A.K., J.E.V.E.), Department of Medicine, Mass Spectrometry and Proteomic Core Facility (R.N.C.), Johns Hopkins University School of Medicine, Baltimore, MD; Thermo Fisher Scientific, Rockford, IL (R.D.B., J.C.R.); Advanced Clinical Biosystems Research...