Western Blot Validation with Human Recombinant Protein<br> Loading: 50 ng per lane of human SARS-CoV-2 Spike S1 recombinant protein. Antibodies: SARS-CoV-2/SARS-CoV Spike, 1h incubation at RT in 5% NFDM/TBST. Secondary: Goat anti-rabbit IgG HRP conjugate at 1:10000 dilution. Lane 1: 1 μg/mL Lane 2: 2 μg/mL Lane 3: 4 μg/mL.