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[Type-specific morphology of viral papillomas (electron microscopic findings in HPV-1 and HPV-4 warts)].

Electron microscopical investigations of cutaneous warts induced by HPV-1 and HPV-4 did not show any differences regarding the ultrastructural morphology of infected cells. There are, however, differences in respect to the degree of the cellular disturbance: Cells rich in particles revealed greater damages than those only showing small amounts of viral particles.