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Enzymatic amplification results showed thatListeriaspecies have at least two 16S-23S rRNA spacer regions of different lengths. These spacer regions ofL. monocytogenes,L. ivanoviiandL. seeligeriwere cloned after enzymatic amplification. Sequence analysis of the inserts revealed two spacers of 245-246 bp and 496-498 bp, respectively, of which the latter included tRNA(Ala) and tRNA(Ile) genes. OneListeriaspp...