Viruses at a glance: Ion mobility mass spectrometry allows the identification and differentiation of states in a viral assembly not only by mass but also by conformation. This approach has been used to obtain a biophysical characterization of the hepatitis B virus capsids, and has shown that of its two distinct icosahedral geometries, the spherical capsid structure is preserved in vacuo (see picture).
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Uetrecht et al. (2008) studied this question.
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