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The nucleotide sequences of 5S rRNAs from two nemerteans (ribbon worms), Lineus geniculatus and Emplectonema gracile have been determined. Emplectonema has two 5S rRNA species that are composed of 119 and 120 nucleotides, respectively. The sequences of these two 5S rRNAs differ at 22 positions. On the other hand, only a single 5S rRNA species was found in Lineus. The sequence similarity percents are 88% (Lineus/Emplectonema longer 5S rRNA), 82% (Emplectonema longer/Emplectonema shorter) and 80% (Lineus/Emplectonema shorter). The comparisons of these sequences with those of other organisms suggest that the phylum Nemertinea is most related to the Mollusca (91%) and the Rotifera (89%), but not to fresh-water planarias (72%).

nucleic acids research

The nucleotide sequences of 5S rRNAs from two ribbon worms:<i>Emplectonema gracile</i>contains two 5S rRNA species differing considerably in their sequences

The nucleotide sequences of 5S rRNAs from two ribbon worms:Emplectonema gracilecontains two 5S rRNA species differing considerably in their sequences