Establishment of left-right asymmetry in vertebrates: genetically distinct steps are involved.

Abstract excerpt

Vertebrates exhibit a characteristic pattern of asymmetrical positioning of the visceral organs along the left-right axis. A remarkable developmental step establishes this pattern--primitive organs migrate from symmetrical midline positions of origin into lateral positions. The first organ to pursue such movement is the cardiac tube, which forms a rightward 'D' loop; other organs follow concordantly. The signals...

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