Table 1.

Comparison of the cluster statistics of intact and truncated ACE2 docked with RBD through HADDOCK docking tool.

#	Protein	HADDOCK-score*	Cluster size	Docking RMSD	Z-score**	Vander Wall energy	Electrostatic energy
1	ACE2	−111	23	0.7	−1.8	−59.9	−151.2
2	tACE2	−126.6	44	0.8	−2.1	−70.9	−185.2

^*The HADDOCK score is defined as: 1.0 Evdw + 0.2 Eelec + 1.0 Edesol + 0.1 EAIR.

^**The Z-score produced by HADDOCK indicates standard deviations from the average cluster (the more negative the better).