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Southern Bean Mosaic Virus (SBMV) (top) and Tomato Bushy Stunt Virus (TBSV) (bottom) were the first icosahedral virus structure coordinates deposited to the PDB in 1984. TBSV was determined in 1978 (6) and SBMV in 1980 (7). Unexpectedly the shell forming domains of both the virus subunits were closely similar and formed what is now known as the virus jellyroll topology. TBSV has an additional C-terminal domain that forms prominent dimers on the capsid surface.
