Protides of the Biological Fluids contains the proceedings of the 23rd Colloquium on "Protides of the Biological Fluids" held in Brugge, Belgium in 1975. The discussions were organized around three themes: proteinase inhibitors, clinical evaluation of plasma protein patterns, and affinity chromatography. Comprised of 117 chapters, this volume begins with an overview of carcinofetal proteins, followed by an analysis of proteinase inhibition. The reader is then introduced to the mechanism and structure of human alpha-1-proteinase inhibitor; some properties of a complex between ?2-macroglobulin and brinase; and the interaction of proteinase inhibitors with blastocyst proteinases involved in implantation. Subsequent chapters deal with the thermodynamics and kinetics of the interaction of trypsin with trypsin inhibitors; purification and characterization of acid-stable proteinase inhibitors from human seminal plasma; and the possible role of protease inhibitors in cartilage metabolism. The book also explores the structure and function of animal proteinase inhibitors as well as techniques and methods used in clinical evaluation of plasma protein patterns. This monograph will be of interest to biologists and research workers in biology.