Additional file 1.

Tomogram of a parapoxvirus. The video shows a negatively stained virion of the Orf parapoxvirus, a section of which is shown in Figure 1C. Each frame of the movie corresponds to a 0.44 nm-thick digital section through the tomogram moving along the tomographic Z-axis (Total Depth nm). Observe the semi-parallel orientation of the surface threads.

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Mast and Demeestere Diagnostic Pathology 2009 4:5   doi:10.1186/1746-1596-4-5