The SARS-Cov spike protein forms a homotrimer that is not disullfide-linked (Song et al, 2004).
Eickmann, M, Pileri, P, Harada, T, Rappuoli, R, Seo, MY, Polo, JM, Yoo, BJ, Coates, SR, Abrignani, S, Stadler, K, Houghton, M, Greer, CE, Uematsu, Y, Song, HC, Han, JH, Choo, QL
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