Table 1. Examples of crystallized VHH-RBD complexes with details of crystallization conditions, the space group, and resolution limit of crystals generated.

Complex	RBD-F2	RBD-H3-C1	RBD-C5
Crystal screen	PactTM	JCSGTM	SG1TM
Crystallisation condition	0.1 M SPG, pH 8, 25% Peg 1500	1.0 M Lithium chloride, 0.1 M Citrate pH 4, 20% Peg 6000	0.2 M Na Acetate, 0.1 M Na Cacodylate pH 6.5 and 30% w/v PEG 8000
Time for crystal formation	3 days	less than 24 h	3 days optimal growth
Ratio	0.2 μL protein with 0.1 μL reservoir	0.2 μL protein with 0.1 μL reservoir	0.1 μL protein with 0.1 μL reservoir
Concentration	34 mg/mL	18 mg/mL	18 mg/mL
Cryoprotectant	glycerol	Peg400	glycerol
Data collection
Exposure	0.006s	0.012s	0.008s
Space group	P31	P41212	P21212
Resolution ( $Å$ )	2.3	1.9	1.5