TrkB expression and dependence divides gustatory neurons into three subpopulations

Half of adult taste neurons express the TrkB receptor. a) Representative image of the entire z-stack of a whole mount adult geniculate ganglion from a Phox2b-Cre::tdTomato::TrkBGFP/+ mouse labeled for both tdTomato (oral cavity-projecting, red) and GFP (TrkB, green). b) Quantification of the total number of neurons (n =？3) projecting to the oral cavity (red only) and oral cavity-projecting neurons that express TrkBGFP (double-labeled). c-e) Magnified images of a single optical section illustrate the criteria used to identify and count single-labeled (arrowhead) and double-labeled (arrow) oral cavity-projecting neurons. Scale bar？=？50？μm (a) and 10？μm (c-e). ***p <？0.00