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Typical MD structures of human ACE2 complex with SARS-CoV-2 designed sequences L455/E493/I494/V501 (a), E455/E493/I494/V501 (b), and L455/Q493/W494/N501 (c). Substituted side chains are shown in stick-and-ball representation and red bold labels. Hydrogen bonds are indicated by dotted yellow lines. To see this figure in color, go online.
