possible origin of the soluble RNA here. More com- plete investigations are required to establish the origin of the RNA of the cytoplasmic fractions. SUMMARY 1. When protoplasts of Bacillus megaterium are incubated with [3H]uridine, RNA with the highest specific radioactivity is found after short periods in the two components of the nuclear fraction. Whereas the radioactivity of the DNA-containing component soon reaches a stage of slow increase, that in the nuclear residue (ribosomal) continues to increase.
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Armstrong et al. (1963) studied this question.
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