The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 157, 2160-2165, Copyright © 1983 by Rockefeller University Press

ARTICLES

Structural heterogeneity of the C3b/C4b receptor (Cr 1) on human peripheral blood cells

TR Dykman, JL Cole, K Iida and JP Atkinson

In these studies CR 1 polymorphism previously demonstrated on erythrocytes (E) was also found on CR 1-bearing peripheral blood leukocytes including polymorphonuclear (PMN), eosinophils, monocytes, and B lymphocytes. However several cell-specific differences in CR1 were found: (a) an approximately 5,000-dalton increase in CR 1 on PMN and eosinophils, (b) unequal band intensity among heterozygotes suggests that there is preferential expression of 220,000- or 225,000- dalton receptors on leukocytes compared to E, and (c) "minor" bands, approximately 15,000 daltons larger than the major receptor molecule, were found on E but not on leukocytes. These observations constitute a unique example of heterogeneity of an integral membrane receptor.
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