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When the membrane components of Xg(a+) erythrocytes were separated by electrophoresis and immunoblotted with an anti-Xga of human origin, two diffuse bands of approximate Mr 22,000-25,000 and 26,500-29,000 were stained. These reactive components were not evident in membranes from proteinase-treated Xg(a+) erythrocytes. Neuraminidase treatment of erythrocytes before immunoblotting resulted in one diffuse Xga-reactive band, the leading edge of which had a slightly increased mobility corresponding to a decrease in Mr of approx. 1500. These results suggest that the membrane components that carry Xga are sialoglycoproteins. A genetic relationship exists between Xga and the antigen recognized by the monoclonal antibody 12E7. An immunochemical comparison of the structures that carry the Xga and 12E7 antigens demonstrated that they differ in Mr and in the way in which they are modified by neuraminidase. This is in accord with evidence that Xga and 12E7 are the products of two separate structural loci.

Identification and immunochemical characterization of the human erythrocyte membrane glycoproteins that carry the Xga antigen