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Embryologic order of development for prostate cells. Urogenital sinus gives rise to the epithelial and mesenchymal cells of the prostate. The epithelial bud differentiates into luminal, basal, and intermediate (not pictured) epithelium. The mesenchymal condensation gives rise to smooth muscle cells, fibroblasts, and endothelial cells that inhabit the extracellular matrix.
