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  • Title: Ferritin-conjugated plant agglutinins as specific saccharide stains for electron microscopy: application to saccharides bound to cell membranes.
    Author: Nicolson GL, Singer SJ.
    Journal: Proc Natl Acad Sci U S A; 1971 May; 68(5):942-5. PubMed ID: 4102564.
    Abstract:
    An electron microscopic stain for specific saccharides was prepared by the conjugation of ferritin to concanavalin A, a plant agglutinin that specifically binds to oligosaccharides containing terminal d-glucose, d-mannose, or sterically related sugar residues. A technique was developed to allow topological visualization of erythrocyte and other membranes by means of transmission electron microscopy, and the distribution of the binding sites for ferritin-concanavalin A on such membrane preparations was determined. The conjugate was found to bind specifically to the outer, but not the inner, surface of erythrocyte membranes. The number of conjugate molecules bound per unit area of the membrane was larger for rabbit than for human erythrocytes.
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