Figure 1. Schematic representation of SARS-CoV glycoprotein cDNAs and expression of recombinant proteins.

a, The structure of the cDNAs used. b, Expression of these constructs, determined by western blot analysis with antisera reactive with SARS-CoV S, was evaluated after transfection of the indicated plasmid expression vectors in 293T cells. Arrows indicate specific SΔCD (upper) and SΔTM (lower) bands.