Abstract

We amplified and cloned twelve 28S-18S ribosomal RNA gene intergenic regions from two crustacean species, the copepod Calanus finmarchicus and the euphausid Thysanoessa raschi. Hybridization of single-stranded and double-stranded versions of these clones with single-stranded oligonucleotide probes showed that at least one 5S ribosomal gene is present on the noncoding strand of all twelve 28S-18S intergenic regions from each species.Key words: concerted evolution, 5S ribosomal genes, 18S ribosomal genes, 28S ribosomal genes.

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