Making Waves for Segments

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Science  20 Apr 2012:
Vol. 336, Issue 6079, pp. 306-307
DOI: 10.1126/science.1222242

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Without a frame of reference, it is difficult to know what is moving. The first step is to make the moving object visible. On page 338 of this issue, Sarrazin et al. (1) have done just that to address a long-standing question about the evolution of segmentation in bilaterian animals.