Abstract
Summary
Virus-like particles similar in uttrastructure to the C-type virus particles found in the mouse leukemias were found selectively localized in the lymphoid germinal centers of 2–6-month-old normal guinea pigs of the Hartley stock. A second type of virus-like particle with a diameter of about 70 m μ and dense central core of 30 m μ was also found in germinal centers.
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