Particles of maize mosaic virus I are bullet-shaped, or hemispherical at both ends. Bullet-shaped particles in phosphotungstic acid measure 2550 × 900 Å, those in uranyl acetate 2410 × 730 Å. The particles appear to consist of an envelope with thread-like or knob-like protrusions, a helical structure composed of beaded units, a hollow cylinder and an inner core. The last has no visible structure but disintegrates often in somewhat spherical masses.
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