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Erythropoietin receptor (EPOR) contains a single N-linked sugar in an extracellular domain. It has been suggested that an erythroleukemia cell line with high sensitivity to EPO expresses a high molecular mass form of EPOR, which appears to be a highly N-glycosylated form responsible for EPO-mediated signal transduction [Sawyer and Hankins (1993) Proc. Natl. Acad. Sci. USA 90, 6849-6853]. To examine...