Before revision:  We then explored the possible transmission path by which SARSCoV2 might have crossed to humans by constructing models of ACE2 receptors of relevant species, and calculating the binding energy of SARSCoV2 spike protein to each. Notably, SARSCoV2 spike protein had the highest overall binding energy for human ACE2, greater than all the other tested species including bat, the postulated source of the virus.
After revision:  We then explored the possible transmission path by which SARSCoV2 might have crossed to humans by constructing models of ACE2 has the strongest binding interaction, significantly greater than for any species proposed as source of the virus.