不仅动物第269页和植物的单个的种之间的界线无可挽回地变得越来越模糊，而且冒出了像文昌鱼和南美肺鱼（注：文昌鱼(Amphioxus)是一种有些像鱼形的小动物，是非脊椎动物到脊椎动物之间的一种过渡形态；产于许多海洋。
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Phylogenetic analysis suggests the amphioxus actin genes have clearly undergone extensive expansion through tandem duplications.
进化分析的结果显示,文昌鱼的肌动蛋白基因家族可能通过串联重复而发生了扩增。
参考来源 - 文昌鱼肌动蛋白基因家族的扩增(英文)Healthy amphioxus with developed gonads were selected from Shazikou natural sea area of Qingdao in June 2008, and cultivated in our laboratory at the Institute of Oceanology, Chinese Academy of Sciences for more than one year.
健康的、性腺发育良好的文昌鱼采自于青岛沙子口海区,在室内进行周年培育。
参考来源 - 室内培育的青岛文昌鱼性腺年周期发育和雌核发育牙鲆生长性腺发育研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N → another name for the lancelet
Amphioxus, a cephalochordate, is an important model for studies of evolution and comparative biology.
文昌鱼是研究进化和比较生物学的重要模式生物。
Amphioxus is becoming an emerging model organism for insights into the origin and evolution of vertebrates.
文昌鱼是研究脊椎动物起源与进化十分珍贵的模式动物。
In evolution, Amphioxus, a cephalochordate, has been regarded as the living fossil closest to the vertebrates.
在进化中，头索动物文昌鱼被认为是接近于脊椎动物的活化石。
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