Neuronal labeling by ISH with either the OR16 (A) or I7 (E) OR probe in normal rat OE visualized with alkaline phosphatase. Boxed areas are shown at higher power in B and F, respectively. Labeled cells are scattered across a restricted territory of the OE and may be close to each other or more highly separated. C, D, Schematics of the OE illustrating the locations of A and E. Scale bars: (in A) A, E, 200 μm; (in B) B, F, 50 μm.