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Journal of Experimental Medicine, Vol 167, 1969-1974, Copyright © 1988 by Rockefeller University Press
ARTICLES |
MC Nussenzweig, AC Shaw, E Sinn, J Campos-Torres and P Leder
Howard Hughes Medical Institute, Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115.
Expression of the membrane-bound version of the human mu chain in transgenic mice results in the allelic exclusion of endogenous mouse Ig heavy chain genes (6). The secreted version of the human Ig transgene has no such effect. F1 hybrid animals that carry transgenes for both secreted and membrane-bound human mu chains produce both forms of the human heavy chain while strongly suppressing endogenous mouse mu expression. The simultaneous expression of the two rearranged transgenes in primary B cells suggests that allelic exclusion operates before the formation of a second functionally rearranged heavy chain gene in vivo.
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