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Amino acid levels in plasma of COVID-19 and control patientsPlasma levels of amino acids, proteolysis markers and amino acid synthesis substrates were determined by UPLC-MS/MS-based metabolomics in COVID-19 patients with low (< 15 pg/mL), and high (> 15 pg/mL) IL-6 levels or in control subjects. Data are expressed in µmol/L. Asterisks indicate levels of significance *p < 0.05; **p < 0.01; ***p < 0.001 vs. control patients
