Images: Larval sea squirt (Ciona intestinalis) with central nervous system dyed blue (top); the diagram at the bottom shows the sea squirt’s evolutionary relationship with us.
(Bottom) The relationships of animals for which genome sequences are now well characterized. Human, mouse, puffer fish (Fugu) and Ciona are all members of the chordate phylum. Flies (Drosophila) and mosquitoes are both arthropods. Worms (C. elegans) are members of the nematode phylum. The comparison of the human genome to a wide range of closely and distantly related genomes is proving to be a powerful tool for identifying functionally important DNA sequences.
Top: Anna De Gregorio/ DOE Joint Genome Institute © 2003
Bottom: DOE Joint Genome Institute © 2003
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