Expansion microscopy for Cell Biology, Volume 161 in the Methods in Cell Biology series, compiles recent developments in expansion microscopy techniques (Pro-ExM, U-ExM, Ex-STED, X10, Ex-dSTORM, etc.) and their applications in cell biology, ranging from mitosis, centrioles or nuclear pore complex to plant cell, bacteria, Drosophila or neurons. Chapters in this new release include Protein-retention Expansion Microscopy: Improved Sub-cellular Imaging Resolution through Physical Specimen Expansion, Ultrastructure Expansion Microscopy (U-ExM), Expansion STED microscopy (ExSTED), Simple multi-color super-resolution by X10 microscopy, Expansion microscopy imaging of various neuronal structures, Mapping the neuronal cytoskeleton using expansion microscopy, Mechanical expansion microscopy, and much more.