This investigation placed the last common ancestor of bilaterian animals at a much younger date, though still older than the Cambrian explosion, somewhere between 573 million and 656 million years ago.

• 这项研究把两侧对称动物最后的共同祖先，定置于较晚的时间，不过仍比寒武纪大爆发的时间要早，大约是6亿5600万年至5亿7300万年前之间。