Figure 4.

There are fewer fungiform papillae in p75^−/− mice than wild type mice. The surface of the tongue tip from a wild type (A) and a p75^−/− mouse (B) stained with methylene blue. The fungiform papillae are clear and easily quantified. The size of fungiform taste buds is unaffected by deletion of p75 (D compared with C). The remaining geniculate ganglion neurons are the same size in p75^−/− mice as in wild type mice (F compared with E).