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The activity of the Nodal antagonist Cerl-2 in the mouse node is required for correct L/R body axis

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Correct establishment of the left/right (L/R) body asymmetry in the mouse embryo requires asymmetric activation of the evolutionarily conserved Nodal signaling cascade in the left lateral plate mesoderm (L-LPM). Furthermore, the presence of Nodal in the node is essential for its own expression in the L-LPM. Here, we have characterized the function of cerl-2, a novel Nodal antagonist, which displays a unique asymmetric expression on the right side of the mouse node. cerl-2 knockout mice display multiple laterality defects including randomization of the L/R axis. These defects can be partially rescued by removing one nodal allele. Our results demonstrate that Cerl-2 plays a key role in restricting the Nodal signaling pathway toward the left side of the mouse embryo by preventing its activity in the right side.

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Left/right asymmetry Neuralizing activity Secreted factor Cerberus like Expression Pitx2 Bmp Lefty-2 Vertebrates Mechanisms

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Cold Spring Harbor Laboratory Press

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