And bilaterians also have an opening for food to go in, an opening for waste to go out and a gut connecting them, basically a tube.

两侧对称动物也有一个让食物进入的开口，一个让废物排出的开口， 还有一个连接它们的肠道， 基本上是一根管子。

To settle the debate researchers mapped gene expression in different bits of starfish anatomy, looking specifically for the genes expressed in the forebrain, midbrain and trunk of other bilaterians.

为了解决这个争论， 研究人员绘制了海星解剖结构不同部位的基因表达图，专门寻找在其他两侧对称动物的前脑、中脑和躯干中表达的基因。