Review "...this is a book that will pleasantly complement a more traditional text in developmental biology...."..."Its molecular grounding is comprehensive and gives the reader all the tools currently available to explain pattern formation. The book will be popular with advanced undergraduates, as well as their teachers." Nature Cell Biology, November 2002. Product Description Molecular Principles of Animal Development by Alfonso Martinez-Arias and Alison Stewart is the only textbook in the field that focuses on the molecules and mechanisms that underlie the developmental process. Offering a compellingly modern way of looking at developmental biology, it reflects recent literature and the dramatic advances and changes in the field over the last decade. It works from the molecular and cellular principles up to the organism level, rather than the traditional top-down emphasis on the complete organism. The authors demonstrate that an understanding of animal development requires an understanding of the universal mechanisms that emerge from molecular networks. Designed for advanced undergraduates and early graduate students, this well-organized book can be used to teach courses at different levels. It includes an introduction and three sections that increase in level of complexity while building on previous sections. It shows that development is not programmed into the genome but is an output of the opportunistic use of molecular networks and routines. Written with a rigorous