Recombinant, human erythropoietin (EPO) expressed in CHO cells. EPO is a glycoprotein hormone produced by the kidneys that is involved in the survival, growth, and differentiation of erythroid precursor cells. Stimulation of erythropoiesis involves the binding of EPO to the extracellular domain of the EPO receptor (EPOR) and triggering of intracellular signaling events, including phosphorylation of the receptor and activation of the JAK-STAT, RAS, and PI3-kinase pathways. Reported to act as a neuroprotective agent. Expressed in and purified from CHO cells. The predicted molecular weight is ~21 kDa, but it migrates at ~37 kDa on SDS-PAGE. Sialic acid content: > 10 moles/mole of protein. Sialic acid content: > 10 moles/mole of protein.