CD71 is a 95 kDa type II heterodimeric transmembrane glycoprotein that is the receptor for transferrin. CD71 expression is very low on resting leukocytes but is upregulated upon activation. CD71 plays a critical role in cell proliferation by controlling the supply of iron, which is essential for many metabolic pathways, through the binding and endocytosis of transferrin.1-4
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