Figure 1.

The notochord of Ciona intestinalis and Oikopleura dioica embryos. Microphotographs of a Ciona intestinalis embryo (A) and an Oikopleura dioica embryo (B) at comparable developmental stages. In each panel the notochord is highlighted by an arrowhead. Anterior is to the left and dorsal is up.

Kugler et al. BMC Evolutionary Biology 2011 11:21   doi:10.1186/1471-2148-11-21
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