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Developmental biology is the scientific study of how organisms grow and develop, from the fertilized egg to the adult form. In this context, development refers to the processes that lead to the formation of complex structures and systems in an organism, starting from a single cell. This field intersects with neuroscience as it examines the developmental aspects of the nervous system, including neural tube formation, neurulation, neural crest migration, and brain development. The study of these topics is crucial for understanding both normal and abnormal development, and has significant implications for medical research, particularly in areas such as birth defects and neurodevelopmental disorders. Therefore, under the broader categories of science, life science, and neuroscience, developmental biology provides a more specific focus on the processes that govern growth and differentiation during organismal development.