Kumazaki T, Hori H, Osawa S
Nucleic Acids Res. 1983 May 25;11(10):3347-50. doi: 10.1093/nar/11.10.3347.
The nucleotide sequences of 5S rRNAs from two Annelida species, Perinereis brevicirris and Sabellastarte japonica, and an Echiura species, Urechis unicinctus have been determined. Their sequences are all 120 nucleotides long. The sequence similarity percents are 88% (Perinereis/Sabellastarte), 90% (Sabellastarte/Urechis) and 92% (Perinereis/Urechis), indicating that the Echiura is indistinguishable from the Annelida by their 5S rRNAs. The 5S rRNA sequences from the Annelida/Echiura are most related to those from the Nemertinea (87%), the Mollusca (87%) and the Rotifera (88%).
已测定了两种环节动物短鳃围沙蚕和日本刺沙蚕以及一种螠虫动物单环刺螠的5S rRNA的核苷酸序列。它们的序列均为120个核苷酸长。序列相似百分比分别为88%（短鳃围沙蚕/日本刺沙蚕）、90%（日本刺沙蚕/单环刺螠）和92%（短鳃围沙蚕/单环刺螠），这表明螠虫动物在5S rRNA方面与环节动物难以区分。环节动物/螠虫动物的5S rRNA序列与纽形动物（87%）、软体动物（87%）和轮虫（88%）的序列关系最为密切。
