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A) Electron microscopical examination showed numerous intranuclear electron dense particles, 45–50 nm in diameter (black arrows). X 15,000. The size and shape of these particles are consistent with the submicroscopic features of viral particles (insert). X 50,000. B) Normal urothelial cells. No electron dense particles are detected in the nucleus of a normal urothelial cell. X 15,000.
