[No authors listed]
Two TGFβ-related proteins, Nodal and Lefty, are asymmetrically expressed and play central roles in establishing left-right (L-R) asymmetry of our body. Nodal acts as a left-side determinant whereas Lefty restricts Nodal activity to the left side by acting as a feedback inhibitor of Nodal. While the mechanism for symmetry breaking is variable among animals, the pair of Nodal and Lefty has a conserved role in the L-R asymmetry pathway. Function and regulation of Nodal and Lefty have been revealed in the last decades, but in this review we summarize the role of TGFβ-related proteins together with more recent findings. We mainly discuss observations made with mouse embryos, unless indicated otherwise.
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