Background：CD123 is the 70 kD transmembrane a chain of the IL-3 receptor. Alone, CD123 binds IL-3 with low affinity; when CD123 associates with CDw131 （common b chain）, it binds IL-3 with high affinity. CD123 does not transduce intracellular signals upon binding IL-3 and requires the b chain for this function. CD123 is expressed by myeloid precursors, macrophages, dendritic cells, mast cells, basophils, megakaryocytes, and some B cells.
