Basement membrane maintenance in cultures of isolated thyroid follicles

Abstract
Follicles from adult rat thyroid glands were isolated by digestion with collagenase followed by sieving. Electron microscopic studies have shown that basement membrane was present around each one of the isolated follicles. Follicles were cultured in vitro with or without thyrotropin and fibronectin. When cultured in a medium free of thyrotropin, basement membrane remained around them, while it was lacking in presence of this hormone.

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