Abstract
The density of protein gene product 9.5- and tyrosine hydroxylase-immunoreactive nerve fibers innervating circumvallate papillae of the tongue was substantially increased in transgenic mice that overexpressed nerve growth factor (NGF) when compared with age-matched controls. The fiber density was age-dependent. Only transgenic mice contained NGF-immunoreactive basal cells in the vicinity of taste buds, indicating that target-derived NGF induced novel hyperinnervation of the circumvallate papillae.
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