Serial sections of vaccinia virus examined at one stage of development in the electron microscope

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Abstract

Two clusters of intracytoplasmic viral particles are illustrated in eight consecutive serial sections. The sections average 30–33 mμ in thickness. The viral particles are spherical with diameters varying from 200–240 mμ. They possess a dense, limiting membrane 9–12 mμ thick. All particles sectioned five or more times can be shown to contain a nucleoid at one stage of development.

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