Table 1.

Characteristics of recombinant human cell receptors and viral spike proteins.

Protein	Vendor	Catalog #	Residues		Length	Molecular Weight (kDa)
			Start	End
hACE2	Sino Biological	10108-H08H	Q18	S740	734	85.1
hDPP4	Sino Biological	10688-H08H	D34	P766	744	86.3
hNRP1	Sino Biological	10011-H08H	F22	K644	634	71.3
hFGFR3	Sino Biological	16044-H08H	E23	G375	364	39.6
SARS-CoV-2 S1 spike	Sino Biological	40591-V08H	V16	R685	681	76.5