Complementary Strategies to Study Virus Structure and Function, Volume 104, the latest release in the Advances in Virus Research series, highlights new advances in the field, with this new volume presenting interesting chapters on X-ray structures from crystals of viral proteins grown in cellula, NMR and SAXS to study protein dynamics and natively disordered viral proteins, Mass spectrometry to study virus particle assembly, Atomic force microscopy to study virus particles, Non-enveloped viruses and interactions with antibodies, Non-enveloped viruses and their mechanism of entry into cells, Structures of enveloped virions by electron cryo-microscopy and cryo-tomography, and many other interesting topics.