Figure 1.

Identification of the olfactory receptor genes in the septal organ. A, Schematic drawing of a rodent nasal septum. Arrows indicate the medial air streams (Kimbell et al., 1997). SO, Septal organ; OB, olfactory bulb; NPH, nasopharynx. B, A coronal section was hybridized with an OMP antisense RNA probe, showing the location of the septal organ. Pictures in C–I were taken approximately from the area within the rectangle. C–I, Sections were hybridized with the following antisense RNA probes: MOR256-3 (C), MOR244-3 (D), MOR0-2 (E), MOR235-1 (F), MOR122-1 (G), MOR160-5 (H), and MOR232-2 (I). Arrowheads indicate stained cells.