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..Evidence is accumulating for the involvement of regulatory evolution in morphological changes between closely related species, as well as in major changes of body plans...
Tautz D. Segmentation. Dev Cell. 2004;7:301-12 pubmed
..An old concept of comparative anatomy, the enterocoele theory, is compatible with a single origin of segmentation mechanisms and could therefore provide a conceptual framework for assessing these molecular similarities. ..