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Ribosomal proteins S1, S2, S16 and S23 were localized on the surface of the small subunit (40S) of rat liver ribosomes by immune electron microscopy. Antibodies against the single proteins were raised in rabbits and chicken and purified by affinity chromatography. 40S-IgG-40S complexes were obtained by incubation of 40S subunits with non-cross-reacting antibodies specific for each of the four proteins and subsequent sucrose density gradient centrifugation. The location of the proteins was determined by means of antibody binding sites visualized in negative contrast in the electron microscope. The four investigated proteins are mainly located in the head region of the small subunit. Exposed antigenic determinants of proteins S1 and S2 were found to be located at different sites of the small subunit whereas proteins S16 and S23 were mapped in a limited region only.
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