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Figure 1: Immunohistochemical staining of hypoxia-inducible factor 1α, p53, and vascular endothelial growth factor (positive expression: (a, c and e); negative expression: (b, d and f) respectively) (×200)

Figure 1: Immunohistochemical staining of hypoxia-inducible factor 1α, p53, and vascular endothelial growth factor (positive expression: (a, c and e); negative expression: (b, d and f) respectively) (×200)