Preface Acknowledgments 1. The nature of development 2. Everything begun to the service of development: cellular Darwinism and the origin of animal form 3. Development: generic to genetic 4. Periodization 5. Body regions, their boundaries and complexity 6. Differentiation and patterning 7. Size factors 8. Axes and symmetries 9. Segments 10. Evo-devo perspectives on homology Summary and conclusions References Index.
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