Expression of AKR murine leukemia virus gp71-like and BALB(X) gp-71-like antigens in normal mouse tissues in the absence of overt virus expression.

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Abstract
By competition radioimmune assays with antisera against AKR murine leukemia virus (MuLV) gp 71 or antisera against xenotropic virus, and iodinated AKR MuLV gp71 or BALB(X) gp71, antigens serologically indistinguishable from the viral antigens can be detected in tissues of normal mice in the absence of overt virus expression. An antigen serologically indistinguishable from AKR MuLV gp71 can be readily detected in normal bone marrow cells of the common strains of mice including NIH Swiss, 129/J, and SWR/J, as well as in Mus cervicolor and Mus musculus casteneus. In contrast, this antigen is not detected in normal spleen, thymus, lymph nodes, or serum. Similarly, an antigen serologically indistinguishable from BALB(X) gp71 was found in all normal mouse sera examined. This antigen was not present in fetal liver, perfused adult liver, thymus, spleen, lymph nodes, or bone marrow of the mice examined. An equivalent antigen was detected in sera from Mus musculus casteneus but not in sera from Mus cervicolor.

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