This second edition book explores breakthrough technologies in the field of drug target identification and validation. The volume emphasizes particularly revolutionary technologies, such as CRISPR-related screening, “big data,” and in silico approaches, as well as in vivo applications of CRISPR and best uses of animal models in drug development. Written for the highly successful Methods in Molecular Biology series, 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.