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mRNA expression levels of hypoxia-inducible factor-1α and vascular endothelial growth factor. A, B: Histograms illustrating hypoxia-inducible factor-1α (HIF-1α) mRNA expression after exposure to various concentrations of CoCl2 for 12 h and 24 h; C, D: Histograms illustrating vascular endothelial growth factor (VEGF) mRNA expression after exposure to various concentrations of CoCl2 for 12 h and 24 h.
