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https://www.selleckchem.com/Androgen-Receptor.html Duchenne muscular dystrophy (DMD) is a degenerative muscle disease that causes progressive loss of muscle mass, leading to premature death. The mutations often cause a distorted reading frame and premature stop codons, resulting in an almost total lack of dystrophin protein. The reading frame can be corrected using antisense oligonucleotides (AONs) that induce exon skipping. The morpholino AON viltolarsen (code name NS-065/NCNP-01) has been shown to induce exon 53 skipping, restoring the reading frame for patients with exon 52 deletions. We recently administered NS-065/NCNP-01 intravenously to DMD patients in an exploratory investigator-initiated, first-in-human trial of NS-065/NCNP-01. In this methods article, we present the molecular characterization of dystrophin expression using Sanger sequencing, RT-PCR, and western blotting in the clinical trial. The characterization of dystrophin expression was fundamental in the study for showing the efficacy since no functional outcome tests were performed.Fast photochemical oxidation of proteins (FPOP) is a mass spectrometry-based structural biology technique that probes the solvent-accessible surface area of proteins. This technique relies on the reaction of amino acid side chains with hydroxyl radicals freely diffusing in solution. FPOP generates these radicals in situ by laser photolysis of hydrogen peroxide, creating a burst of hydroxyl radicals that is depleted on the order of a microsecond. When these hydroxyl radicals react with a solvent-accessible amino acid side chain, the reaction products exhibit a mass shift that can be measured and quantified by mass spectrometry. Since the rate of reaction of an amino acid depends in part on the average solvent accessible surface of that amino acid, measured changes in the amount of oxidation of a given region of a protein can be directly correlated to changes in the solvent accessibility of that region between different con

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