A sequencer of thirty bases that is highly repetitive in archaebacterial genomes

In the genomes of various archaebacterial species essentially the some sequ ence of approximately 30 bp is identified repeating over 100 times position ed in several clusters. The periodicity of the repeat is close to 67 bp, ha ving a linker of approximately 37 bp between neighbouring units. Small diff erences found between the units are essentially the signatures that specify first the cluster, and second the archaebacterial species to which the uni ts belong. Similar repeats are found in the genomic DNA sequences of eubact erial species, Aquifex aeolicus, and Myobacterium tuberculosis.