Sonic hedgehog from both nerves and epithelium is a key trophic factor for taste bud maintenance.
Castillo-Azofeifa D, Losacco JT, Salcedo E, Golden EJ, Finger TE, Barlow LA. Sonic hedgehog from both nerves and epithelium is a key trophic factor for taste bud maintenance. Development. 2017 09 01; 144(17):3054-3065.