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Homology 3D modeling. (A.) Spike glycoprotein where dots in green color represent the receptor-binding domain. (B.) ACE2 (angiotensin-converting enzyme) and (C.) DPP4 (Dipeptidyl peptidase-4) receptor with the help of SWISS-MODEL. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
