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Our results firmly demonstrate that each of extant deuterostome phyla and chordate subphyla is monophyletic. 我们的结果表明现存后口动物中各个门均为单系起源,同样脊索动物的各个亚门也为单起源,但在系统发生关系分析中,序列选择的变化能够导致不同的进化树生成。