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The optimal duration of dual antiplatelet therapy (DAPT) after treatment of chronic total occlusions (CTO) with percutaneous coronary intervention (PCI) is unknown. We aimed to determine if extended ( 12 months) DAPT was associated with a net clinical benefit. The study population included patients who underwent successful CTO PCI within Kaiser Permanente Northern California between 2009 and 2016. Baseline demographic, clinical, and procedural characteristics were compared for patients on DAPT ≤ versus 12 months. Clinical outc

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We report here a method for the determination of the pKa of histidine in complex or heterogeneous systems amenable to neither solid-state nor solution NMR spectroscopy. Careful synthesis of a fluorenylmethyloxycarbonyl- and trityl-protected, C2-deuterated histidine produces a vibrational-probe-equipped amino acid that can readily be incorporated into any peptide accessible by standard solid-phase methods. The frequency of the unique, Raman-active stretching vibration of this C2-D probe is a clear reporter of the protonation state of h