EMT Concept and Examples from the Vertebrate Embryo -- Epithelium-Mesenchyme Transitions Are Crucial Morphogenetic Events Occurring during Early Development -- The Neural Crest -- Epithelial-Mesenchymal Transformation in the Embryonic Heart -- Epithelial-Extracellular Matrix (Cell-ECM) Interactions in Hydra -- Regulation of the Epithelial-to-Mesenchymal Transition in Sea Urchin Embryos -- Chang…