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SARS-CoV S Δ19 protein and amino acid substitutions in the juxtamembrane domain. (A) Full-length SARS-CoV S protein and S Δ19 truncated S protein. The receptor binding domain (RBD), HR-1, HR-2, and JMD are labeled in gray. (B) Positions of alanine substitutions in SARS-CoV S Δ19. Dashes indicate amino acid residues identical to those of the wild type.
