Left: HEK293T transfected with plasmids overexpressing SARS-Cov2 S-Gene extracellular domain (Cat# VC102556 ). Cells were fixed in 2% neutral buffer formalin and detected with anti-DDK antibody ( Cat# [TA150078]). Polink1 anti Rabbit HRP polymer (Cat# [D13-18]) was done for 30 min room temperature followed by DAB. 40x image. Right: Untransfected HEK293T.