Non-transfected and transfected 293T whole cell extracts were separated by 5% SDS-PAGE, and the membrane was blotted with SARS-CoV-2 (COVID-19) Spike antibody (GTX135356) diluted at 1:5000. The HRP-conjugated anti-rabbit IgG antibody (GTX213110-01) was used to detect the primary antibody.

Sandwich ELISA detection of non-transfected (GTX535673) and SARS-CoV-2 spike (full length) transfected (GTX535664) 293T whole cell extracts using SARS-CoV-2 (COVID-19) Spike S1 antibody [GT263] (GTX635708) as capture antibody at concentration of 5 μg/mL and SARS-CoV-2 (COVID-19) Spike S1 antibody [HL263] (GTX635672) as detection antibody at concentration of 1 μg/mL. Rabbit IgG antibody (HRP) (GTX213110-01) was diluted at 1:10000 and used to detect the primary antibody.

SARS-CoV-2 (COVID-19) spike 293T overexpression cell lysates (GTX535664) were separated by 7.5% SDS-PAGE, and the membrane was blotted with SARS-CoV / SARS-CoV-2 (COVID-19) spike antibody [1A9] (GTX632604) diluted at 1:1000. The HRP-conjugated anti-mouse IgG antibody (GTX213111-01) was used to detect the primary antibody, and the signal was developed with Trident ECL plus-Enhanced.