Left-Right Asymmetry

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Science  28 Feb 1997:
Vol. 275, Issue 5304, pp. 1280
DOI: 10.1126/science.275.5304.1280

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Although vertebrates appear symmetrical on the surface, their viscera show pronounced left-right asymmetry. In an illustrated Perspective, Robertson summarizes what has been found to date about the molecular underpinnings of the asymmetry set up during embryogenesis, including a report in this week's issue by Isaac et al. (p. 1301) on the asymmetric expression of the transcription factor cSnR in the chick embryo.