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A) H bonds between RBD of A) nCOV-2019 and B) SARS-COV. B) mapping contribution of interface residues to structure in RBD of nCOV-2019. The RBD domain is purple and the ACE2 is yellow. The RBD in contact with AC2 is rendered in a surface format with more red being a favorable contribution to binding (more negative) and blue unfavorable contribution (positive).
