The deuterostome ancestor.

@article{Gerhart2006TheDA,
  title={The deuterostome ancestor.},
  author={John C. Gerhart},
  journal={Journal of cellular physiology},
  year={2006},
  volume={209 3},
  pages={677-85}
}
Hemichordates, the phylum of bilateral animals closest to chordates, can illuminate the evolutionary origins of various chordate traits to determine whether these were already present in a shared ancestor (the deuterostome ancestor) or were evolved within the chordate line. We find that an anteroposterior map of gene expression domains, representing 42 genes of neural patterning, is closely similar in hemichordates and chordates, though it is restricted to the neural ectoderm in chordates… CONTINUE READING
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