Beta-catenin signaling subdivides the oral-aboral axis of the sea anemone Nematostella vectensis into spatial domains. A) Fluorescence in situ hybridization shows the borders between the oral domain (unstained), the midbody domain (stained with the Sp6-9 probe, green) and the aboral domain (stained with the Six3/6 probe, yellow) in the gastrula stage embryo of the sea anemone Nematostella vectensis. The boundaries of the ectodermal and the endodermal cell layer are outlined in white. Corresponding expression domain boundaries are marked with arrowheads of the same color. B) Juvenile polyp of Nematostella vectensis in the same orientation as the gastrula on (A) with all the morphological features (e.g. mouth, tentacles) developing at their proper positions along the oral-aboral axis.
Beta-catenin signaling subdivides the oral-aboral axis of the sea anemone Nematostella vectensis into spatial domains. A) Fluorescence in situ hybridization shows the borders between the oral domain (unstained), the midbody domain (stained with the Sp6-9 probe, green ) and the aboral domain (stained with the Six3/6 probe, yellow ) in the gastrula stage embryo of the sea anemone Nematostella vectensis. The boundaries of the ectodermal and the endodermal cell layer are outlined in white. Corresponding expression domain boundaries are marked with arrowheads of the same color. B) Juvenile polyp of Nematostella vectensis in the same orientation as the gastrula on (A) with all the morphological features (e.g. mouth, tentacles) developing at their proper positions along the oral-aboral axis. Grigory Genikhovich and Tatiana Lebedeva) - Similarity in axis formation of sea anemones and sea urchins provides insight into axis formation in prehistoric animals Body axes are molecular coordinate systems along which regulatory genes are activated.
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