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immature thymic epithelium
Epithelium of the thymus primordium composed of cells of immature morphology. The immature thymic epithelium is continuous with the pharyngeal epithelium. The immature thymic epithelium is composed of electron-lucent epithelial cells of irregular or polygonal shape and contain numerous ribosomes, large electron-lucent mitochondria, and rough endoplasmic reticulum. Nascent desmosomes join these primitive epithelial cells together.