Figure 4.

A, B, OSNs labeled by ISH with either OR14 or OR37 riboprobe, respectively, on adjacent sections of control epithelium (CI-127). In this and subsequent figures, the lines drawn in the nasal airspace designate the extent of labeling with the alternate probe on the adjacent section. Note that areas of the epithelium are unique to each probe. C, Double ISH in a single section with both OR14⁺ OSNs (purple) and OR37⁺ OSNs (orange). Receptor distribution is stratified, and there is no evidence of colabeling of individual neurons. D, Schematic of a hemisection from the CI-127 showing the location of the photomicrographs. Scale bars: (in B) A, B, 500 μm; C, 100 μm.