they express the intermediate filament protein vimentin, a feature used as a marker to distinguish their mesodermal origin. However, this test is not specific as epithelial cells cultured in vitro on adherent substratum may also express vimentin after some time.

In certain situations, epithelial cells can give rise to fibroblasts, a process called epithelial-mesenchymal transition.

Conversely, fibroblasts

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