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Taste sensitivity decreases with age. Therefore, we investigated the histological and immunohistochemical changes in the receptive fields circumvallate papilla (CvP) and fungiform papilla (FfP) to explore the mechanism underlying age‐related changes in taste sensitivity in 6‐ to 72‐week‐old rats. We analyzed papilla size, the thickness of the keratin layer of the papilla and stratified squamous epithelium,...