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Within the TGF-β superfamily, there are approximately forty ligands divided into two major branches: the TGF-β/Activin/Nodal ligands and the BMP/GDF ligands. We studied the ligand GDF3 and found that it inhibits signaling by its co-family members, the BMPs; however, GDF3 has been described by others to have Nodal-like activity. Here, we show that GDF3 can activate Nodal signaling, but only at very...
Ascidians were historically the first metazoans in which experimental embryology was carried out. These early works by Chabry and Conklin [Chabry, L., 1887. Embryologie normale et tératologique des Ascidie. Felix Alcan Editeur, Paris; Conklin, E., 1905. The organization and cell lineage of the ascidian egg. J. Acad., Nat. Sci. Phila. 13, 1], in particular, led to the idea that the developmental program...
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