Ontogenetic Differentiation of Epithelial and Non-Epithelial Cells in the Human Thymus
Most electron microscopical and functional reports dealing with the ontogenesis of the thymus in laboratory animals and man (1,2) consider almost only the differentiation of its typical “lymphoid” organization. The aim of the present study was to determine whether the main epithelial and mesenchymal structures develop before, or at the same time as the first lymphoid cells are seen in the thymus, i.e. whether the differentiation of a characteristic microecology may be regarded as a necessary prerequisite for lymphoid colonization.
KeywordsSemi Thin Section Myoid Cell Peripheral Lymphatic Tissue Thymic Medulla Interdigitating Reticulum Cell
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