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a Strong expression of VEGF-R2 in tumour cells in lung tissue of a control mouse (magnification ×40; Positive expression of VEGF-R2 appear as brown stains in cells) b Weak expression of VEGF-R2 in tumour cells in lung tissue of an experimental mouse (magnification ×40; Positive expression of VEGF-R2 appear as brown stains in cells)
