This volume explores the latest techniques used to characterize murine and human Innate Lymphoid Cells (ILC) subsets. This book also aims to discuss useful phenotypical and functional assays that may be relevant for studying ILC function in mice and humans. Chapters cover topics such as methods to study microbiome and enteroid cultures; characterizing ILC precursors; and cellular engineering of ILCs for therapeutic use. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls.