Expression of TeNT in the MC-dense region of the whisker FSC and barrel-field cytoarchitecture. (A-B) Longitudinal sections of the whisker FSC stained for cell nuclei and actin filaments from control (A) and MCTeNT (B) mice. Note the presence of a green fluorescence signal indicative of the expression of TeNT-GFP at the level of the MC-dense region (MDR) of the whisker FSC in MCTeNT mice. ICB: Inner canonical body; MDR: Merkel cell dense region; RS: Ring sinus; RW: Ringwulst. Scale bar, 100 µm. C, caudal; L, lateral. (C-D) Flattened tangential sections of layer IV wS1 cortex (left hemisphere) stained for cytochrome oxidase from control (C) and MCTeNT mice (D). Scale bar, 500 µm. C, caudal; L, lateral.