Abstract
High-affinity receptors for interleukin-3 (IL-3), IL-5, and granu-locyte-
macrophage colony-stimulating factor (GM-CSF) are
composed of two distinct subunits, a ligand-specific a chain
and a common ß chain (ßc). Whereas the mouse has two
homologous ß subunits (ßc and bIL-3), in humans, only a
single ß chain is identified. We describe here the isolation
and characterization of
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