Figure 1.

Invertebrate chordate notochords. (a) Expression of the gene brachyury (Odi-T) in the developing notochord of Oikopleura dioica (image courtesy of Cristian CaƱestro and Susan Bassham). (b) The Ciona intestinalis notochord visualized with a brachyury LacZ reporter gene (image courtesy of Peter Osborne). (c) The head of a juvenile amphioxus (Branchiostoma lanceolatum), with the notochord distinguishable up to the anterior-most tip of the animal's head and indicated by the arrow (image by the author).

Ferrier BMC Biology 2011 9:3   doi:10.1186/1741-7007-9-3
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