Fig. 1 (IMAGE) Osaka University Caption Serum levels of D-amino acids decrease in patients with severe COVID-19 Credit 2022, Tomonori Kimura, D-Alanine as a biomarker and a therapeutic option for severe influenza virus infection and COVID-19, Biochimica et Biophysica Acta - Molecular Basis of Disease Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.