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The rickettsial agent Coxiella bumrneti, which is a prokaryotic organism, is an intracellular obligate parasite with a broad host range. Although the organisms incorporate amino acids (Mallavia & Paretsky, 1967), and electron microscopy shows structures similar to ribosomes (Burton, Kordova & Paretsky, 1971), there has been no direct demonstration of their presence. We now present evidence for the existence of rickettsial ribosomes.
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Thompson et al. (1971) studied this question.
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