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Expression of AmphiColA during lancelet development. Whole-mount in situ hybridizations of lancelet embryos with an AmphiColA antisense riboprobe are shown. Anterior is to the left in A–C and to the right in D. Stages shown are 18 h (A), 30 h (B), 36 h (C), and 5 days (D) postfertilization. (A Inset) Transverse section of 18-h embryo. The arrowhead indicates notochord, and the arrows point to the neural tube.
