1. The sucrose-gradient pattern of (32)P-labelled RNA synthesized in actinomycintreated baby-hamster kidney cells infected with foot-and-mouth-disease virus depends greatly on the period of labelling. 2. Fractions are formed in infected cells that sediment at 12-20s and have the same base composition as similar fractions found in non-infected cells that have been treated with actinomycin. 3. In the presence of guanidine, which completely inhibits viral RNA synthesis, these fractions are labelled to a greater extent than in non-infected cells.
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