Protides of the Biological Fluids covers the proceedings of the 28th Meeting on Protides of the Biological Fluids held in 1980. This book mainly focuses on the evolution of proteins; the molecular biology of blood coagulation and fibrinolysis; and the hybridomas. In studying the evolution of proteins, this text looks into the evolutionary studies of immunoglobulin protein and nucleic acid sequences, fibrinogen, proteases, and other proteins. This book then explains molecular biology of blood coagulation and fibrinolysis by explaining the Hageman factor, kallikrein–kinin system, human high molecular weight, and other biological processes involved. The hybridomas and monoclonal antibodies are also tackled by specifically discussing the production of monoclonal antibodies; monoclonal antibody conformation; and monoclonal antibodies against molecules. This publication will be invaluable to students, practitioners, and researchers in the field of biology and physiology who are interested in studying protides.