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Our results firmly demonstrate that each of extant deuterostome phyla and chordate subphyla is monophyletic. 我們的結果表明現存後口動物中各個門均爲單系起源，同樣脊索動物的各個亞門也爲單起源，但在系統發生關系分析中，序列選擇的變化能夠導致不同的進化樹生成。