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FSP‐1–positive cells only partially responsible for collagen I and III production in irradiated bladders. Bladder strips from irradiated mice were costained for collagen I or for collagen III mRNA (pink) and for fibroblasts (FSP‐1, brown). U: urothelium; LP: lamina propria. Black arrow: FSP‐1 positive cells. Gray arrow: collagen only positive cells. Scale bar = 50 µm
