Paramecium bursaria chlorella virus infects algae. It has about 375 genes, almost as many as the smallest single cell organisms. It is 190 nm across along a 5-fold symmetry axis. A crystal structure of the capsid protein was fit to a density map obtained by cryo-electron microscopy. The structure is described in N. Nandhagopal, et al., PNAS (2002) 99(23):14758-63.
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