Figure 1: Phylogenetic analyses of 170 nuclear proteins and 13 mitochondrial proteins support a monophyletic chordate clade and an independent deuterostome phylum of Xenoturbellida. We note that ...

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Life began on Earth more than 3.5 billion years ago, but the history of humans and other vertebrates accounts for only a fraction of this timescale. Chordates (a group that includes vertebrates) and ...

There’s a unity to life. Sometimes it’s plain to see, but very often it lurks underneath a distraction of differences. And a new study shows that there’s even a hidden unity between our slipped disks ...