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Ectodermal appendages during early stages of development. Ectoderm-derived structures start to develop from embryonic ectoderm upon mesenchymal inductive signals. The formation of the epithelial placodes, and their subsequent growth into the mesenchyme, is common to the early development of all ectodermal organs. At later developmental stages, epithelial buds undergo different morphogenetic programs resulting in the formation of highly specialized structures.
