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Unit 4 Opener Figure 22.1 Neurulation in the mammalian embryo Figure 22.1 Neurulation in the mammalian embryo (Part 1) Figure 22.1 Neurulation in the mammalian embryo (Part 2) Figure 22.1 Neurulation in the mammalian embryo (Part 3) Figure 22.1 Neurulation in the mammalian embryo (Part 4) Figure 22.2 The neural crest Box 22A(1) Stem Cells: Promise and Peril Box 22A(2) Stem Cells: Promise and Peril Figure 22.3 Major inductive signaling pathways in vertebrate embryos Figure 22.3 Major inductive signaling pathways in vertebrate embryos (Part 1) Figure 22.3 Major inductive signaling pathways in vertebrate embryos (Part 2) Figure 22.3 Major inductive signaling pathways in vertebrate embryos (Part 3) Box 22B Retinoic Acid: Teratogen and Inductive Signal Figure 22.4 Local signals specify sensory relay neurons, interneurons, and motor neurons Figure 22.4 Local signals specify sensory relay neurons, interneurons, and motor neurons (Part 1) Figure 22.4 Local signals specify sensory relay neurons, interneurons, and motor neurons (Part 2) Figure 22.5 Regional specification of the developing brain Figure 22.5 Regional specification of the developing brain (Part 1) Figure 22.5 Regional specification of the developing brain (Part 2) Figure 22.5 Regional specification of the developing brain (Part 3) Box 22C Triple Jeopardy: Multiple Diseases Associated with Sonic Hedgehog Box 22C Triple Jeopardy: Multiple Diseases Associated with Sonic Hedgehog (Part 1) Box 22C Triple Jeopardy: Multiple Diseases Associated with Sonic Hedgehog (Part 2) Figure 22.6 Sequential gene expression divides the embryo into regions and segments Figure 22.6 Sequential gene expression divides the embryo into regions and segments (Part 1) Figure 22.6 Sequential gene expression divides the embryo into regions and segments (Part 2) Figure 22.6 Sequential gene expression divides the embryo into regions and segments (Part 3) Box 22E Rhombomeres Box 22E Rhombomeres (Part 1) Box 22E Rhombomeres (Part 2) Figure 22.7 Nuclear migration and mitosis in precursor cells in vertebrate neuroepithelium Figure 22.7 Nuclear migration and mitosis in precursor cells in vertebrate neuroepithelium (Part 1) Figure 22.7 Nuclear migration and mitosis in precursor cells in vertebrate neuroepithelium (Part 2) Figure 22.8 Generation of cortical neurons during the gestation of a rhesus monkey Box 22F Neurogenesis and Neuronal Birthdating Box 22F Neurogenesis and Neuronal Birthdating Figure 22.9 Mechanisms that guide neuronal and glial differentiation in neural ectoderm Figure 22.9 Mechanisms that guide neuronal and glial differentiation in neural ectoderm (Part 1) Figure 22.9 Mechanisms that guide neuronal and glial differentiation in neural ectoderm (Part 2) Figure 22.9 Mechanisms that guide neuronal and glial differentiation in neural ectoderm (Part 3) Figure 22.10 Cell–cell interactions determine cell fate in the compound eye of Drosophila Box 22G Mixing It Up: Long-Distance Neuronal Migration Figure 22.11 Gene expression and cell–cell signaling during neural crest development Figure 22.11 Gene expression and cell–cell signaling during neural crest development (Part 1) Figure 22.11 Gene expression and cell–cell signaling during neural crest development (Part 2) Figure 22.12 Radial migration in the developing cortex Figure 22.12 Radial migration in the developing cortex (Part 1) Figure 22.12 Radial migration in the developing cortex (Part 2) Figure 22.13 Mutations in genes that influence neuronal migration cause malformations of the human cerebral cortex