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. 1971 Jul;68(7):1416–1420. doi: 10.1073/pnas.68.7.1416

Quantitative Two-Dimensional Ultrastructural Distribution of Rho(D) Antigenic Sites on Human Erythrocyte Membranes*

Garth L Nicolson 1,2, S P Masouredis 1,2, S J Singer 1,2
PMCID: PMC389207  PMID: 4997756

Abstract

A method is described for determining the two-dimensional distribution of specific antigens on cell surfaces, and is applied to the D antigen of the Rh antigenic system. Rh-positive human erythrocytes are allowed to react with purified 125I-labeled human anti-Rho(D) γ-globulin antibodies, and the sensitized cells are then lysed at an air-water interface. The residual cell membranes are spread flat by surface forces, and are picked up on a carbon-strengthened collodion-coated electron microscope grid. The membranes are then stained with ferritin-conjugated goat antibodies directed against human γ-globulins. Only Rh-positive cells sensitized with anti-Rho(D) antibodies bind the ferritin-conjugated antihuman γ-globulins. The ferritin particles are found in small clusters on the membrane surface, and the number of such clusters per unit area agrees with the number of 125I-labeled anti-Rho(D) antibodies bound per unit area. The Rho(D) antigenic sites appear to be molecularly dispersed on the membrane surface, but in a random two dimensional array.

Keywords: ferritin-conjugated γ-globulins, surface antigens

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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