Figure 1.

Western blot analysis of purified SARS-CoV-2 PsIV. Presence of SARS-CoV-2 antigens was evaluated by separate Western blots using antibodies specific for spike protein (S), nucleocapsid protein (N), or membrane protein (M). The lanes from the N and M Western blots are shown next to the lanes from the S Western blot. Two distinct bands were observed when spike protein-specific antibodies were used: one for the S protein monomer at 140 Kda and a second band for S1 subunit at 76 Kda.