The 3D models in part a are reproduced with permission from Daum, B The 3D models in part a are reproduced with permission from Daum, B. et al. Self-assembly of the general membrane-remodeling protein PVAP into sevenfold virus-associated pyramids. Proc. Natl Acad. Sci. USA 111, 3829–3834 (2014), Proceedings of the National Academy of Sciences. The 3D models in part b are reproduced with permission from American Society for Microbiology: Quemin, E. R. et al. Eukaryotic-like virus budding in Archaea. mBio 7, e01439‑16 (2016) http://dx.doi.org/10.1128/mBio.01439-16.