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Representative images of pFRS2α urothelial staining 15 hours after s.c. PBS or keratinocyte growth factor (KGF) administration. A–D: Immunofluorescence for pFRS2α (green) reveals no urothelial staining in PBS-pretreated mice (arrow) and linear membrane staining throughout the urothelium in KGF-pretreated mice (arrowheads). A and C: DAPI channels. Scale bar = 50 μm (A–D). L, lumen.
