The 17 interesting chapters included in this book have been organised into four sections: Soluble Protein Complexes, Membrane Protein Complexes, Fibrous Protein Complexes and Viral Protein Complexes. Significant topics present here are: Fatty Acid Synthase, the Fork Protection Complex, Ribonucleotide Reductase, the Kinehore, G proteins, the FtsEX Complex, the Kainate Receptor, the Photosystem I-antenna, the Mycobacterial Arabinofuranosyltransferases, the the Bacterial Flagellum, the Actomyosin Complex, Motile Cilia, SLS Collagen Polymorphic Structures, and the Reovirus Capsid and Polymerase. Up-dates/expansion of chapter topics present in earlier volumes are now included in chapters here, e.g., those on Ferritin-like proteins and the Multi-tRNA Synthetase. The book is richly illustrated throughout, the result of an impressive integration of structural data from X-ray crystallography and cryo-electron microscopy. The functional aspects of protein-protein interactions are also given a high priority.