Writing a textbook on developmental biology is, today, a dangerous task. The amount of data being produced in labs all over the world overwhelms every effort to be up to date, or to be fair to every developmental biologist in the business. Today, the study of developmental biology entails a vast array of conceptual frameworks, methodologies and exploration tools, making it all but impossible to cover ad extenso the sources, applications and directions of research. As a result, textbooks on developmental biology, while trying to cover as much ground as possible, have to focus on some specific issues. The convergence of genetics and embryology on the key problems faced by developmental biologists makes both disciplines absolutely necessary in an entry-level book such as this one. A winning book also has to look at mechanisms that bridge genetics and embryology to show how regulatory gene networks relate to cell biology, hint...

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