Liebermann D, Hoffman-Liebermann B, Weinthal J, Childs G, Maxson R, Mauron A, Cohen S N, Kedes L
Nature. 1983;306(5941):342-7. doi: 10.1038/306342a0.
A 3-kilobase DNA segment characteristic of a transposable element was found within a histone H2B pseudogene in a higher eukaryote, the sea urchin Stronglyocentrotus purpuratus. The inserted segment (TU1) is flanked by 8-base pair (bp) direct repeats of the H2B sequence. TU1 has long terminal inverted repeats approximately 840 bp long with an outer domain of 15-bp tandem repeats and a non-repeating inner domain, and is a member of a heterogeneous family of transposable elements. TU1 differs from most previously characterized eukaryotic transposable elements with terminal direct repats, but resembles the foldback transposon family in Drosophila.
在高等真核生物紫球海胆的组蛋白H2B假基因内发现了一段具有转座元件特征的3千碱基DNA片段。插入片段（TU1）两侧是H2B序列的8碱基对（bp）直接重复序列。TU1具有约840 bp长的长末端反向重复序列，其外部结构域为15 bp串联重复序列，内部结构域为非重复序列，是一个异质转座元件家族的成员。TU1与大多数先前表征的具有末端直接重复序列的真核转座元件不同，但类似于果蝇中的回折转座子家族。
