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Department of Virology and Epidemiology Baylor College of Medicine, Houston, Texas 77025 U.S.A.
Changes in the cell membranes after infection or transformation of cells by oncogenic viruses have been demonstrated using a plant agglutinin, Concanavalin A (Con. A) isolated from Jack beans. Upon infection or transformation of cells by oncogenic viruses, the cells agglutinate in the presence of Con. A (Inbar & Sachs, 1969; Ben-Bassat, Inbar & Sachs, 1970; Benjamin & Burger, 1970). Moore & Temin (1971) reported a lack of correlation between transformability by RNA tumor viruses and agglutinability of cells by Con. A. Recent evidence (Cline & Livingston, 1971; Ozanne & Sambrook, 1971; Arndt-Jovin & Berg, 1971; Inbar, Ben-Bassat & Sachs, 1971) has suggested that both normal and transformed cells have the same number of Con. A binding sites but agglutinate differentially to a given concentration of Con. A. Nicolson (1971) showed that single Con. A binding sites at the surface of normal cells are randomly distributed whereas in transformed cells the Con. A sites are present in clusters.
Received 24 September 1971;
accepted 10 January 1972.
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