Protides of the Biological Fluids: An International Review Series Devoted to Proteins and Related Studies, Volume 29: Membrane Proteins, Receptor Ligand Interactions, Monoclonal Antibodies, New Methods focuses on membrane proteins, receptor-ligand interactions, and monoclonal proteins as a reagent. The selection first offers information on H-Y and sex determination and aspects of the difficulties to purify membrane proteins. Topics include solubilization by acylation, influence of supporting media on the aggregation of proteins, solubilization with detergents and organic solvents, and membrane proteins - giant detergent molecules. The text then examines the application of group-specific reagents for hydrophobic labeling and crosslinking of membrane proteins and comparison of secreted and membrane-bound human immunoglobulins M and D. The publication tackles sialoglycoproteins (glycophorins) in the plasma membranes of different cells and their receptor functions and the structures and antigenic properties of human erythrocyte membrane sialoglycoproteins. Discussions focus on the primary structure of human erythrocyte glycophorins, molecular structure of the MN bloodgroup substance, and genetic variants of glycophorin A. The book also takes a look at the glycoproteins of the human syncytiotrophoblastic plasma membrane and structure and function of a membrane glycoprotein encoded in the adenovirus genome. The selection is a valuable reference for readers interested in membrane proteins, receptor ligand interactions, and monoclonal antibodies.