DNA from 28 strains of phytopathogenic mycoplasmalike organisms that represented five primary taxonomic clusters was digested with restriction endonucleases and hybridized with several ribosomal probes. The results indicate the presence of two sets of ribosomal genes in all strains examined. Restriction maps of the two ribosomal operons for a group of 12 aster yellows mycoplasmalike organisms were constructed.
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Schneider et al. (1994) studied this question.
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