In YAC Protocols experienced researchers offer a comprehensive collection of their easily reproducible and proven methods for analyzing complex human, animal, and plant genomes. The step-by-step protocols cover all aspects of yeast artificial chromosomes, ranging from the construction of YAC libraries to their storage, screening, and database management, and to their use in such specialist applications as the transfer of YACs to mammalian cells and the isolation of coding sequences from YACs. YAC Protocols allows workers to add promising approaches adapted from yeast genetics to their personal repertoires and to introduce novel techniques emerging from the accumulating experience with YACs as a tool for genome analysis. Its extensive notes and background information not only significantly enhance the effective use of the methods, but also provide a valuable hands-on resource for those wishing to adapt protocols to suit their own applications.