Assertion: lipid's structure | /r/HasProperty | sander et al.
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text: Thus, we can broadly divide viruses into five classes based on structure: helical nonenveloped virions (e.g. tobacco mosaic virus), helical enveloped virions (e.g. rabies virus; Figure 1 a), icosahedral nonenveloped virions (e.g. adenovirus), icosahedral enveloped virions (e.g. herpes simplex virus) and other more complex structures (e.g. pox viruses, such as smallpox and vaccinia virus) (Sander et al. , 2002 ).