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In a number of recent papers (1, 4, 7, 10, 11) it has been shown by electron microscopy that viruses which infect and propagate in HeLa cell cultures, form intranuclear crystalline aggregates. Each of these is composed of a closely packed lattice of regularly ordered spherical viral particles, with a periodicity of about 600 A. Using an improved shadow casting technique, Labaw and Wyckoff (8) published micrographs of edestin crystals, tobacco protein, and virus protein crystals. Recently Elbers (3), who used sectioned material, showed that the

The Ultrastructure of Yolk Platelets of Amphibian Oocytes