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Models for free energy calculation. (a) spike trimer with one RBD in an up position and ACE2/B0AT with one RBD (green) bound, which RBD would be replaced with the trimeric spike. (b) One ACE2/B0AT dimer to one spike trimer. (c) Two ACE2/B0AT dimers bound to one spike trimer. (d) Three ACE2/B0AT dimers bound to one spike trimer. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
