以下为句子列表：
英文: The sea urchin represents the first sequenced genome from the echinoderms, which are the closest known relatives of the chordates, the group that includes vertebrates, animals with spinal columns.
中文: 海胆是首个被排序的棘皮动物，这是与离脊索动物（也包括有脊椎动物）最近的亲属。
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