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Erythropoietin (EPO) protects 6-hydroxydopamine(6-OHDA)-lesioned dopaminergic neurons. Tyrosine hydroxylase (TH)-positive neurons in the substantia nigra (SN) at 21 days after the lesion. Data are expressed as numbers (mean ± SEM) in the lesioned SN as a percentage of those in the intact SN. *P<0.01 vs. sham-lesion; **P<0.01 vs. 6-OHDA alone; n=5 for each group.
