1.   Each nerve cell in the olfactory epithelium seems to switch on just one of these genes, Dr. Buck has found, choosing the gene apparently at random.

2.   In the surgery, he excised the olfactory epithelium high in the nose on the affected side, cutting the small nerves that pass up through the bony plate.

3.   Over evolutionary time, these receptors congregated deep in the nasal cavity, in a region called the olfactory epithelium.

4.   Sperm cells turn out to bear on their surface the same odor receptors stippling the nerves of the olfactory epithelium.

5.   Spicy food, stimulates odor receptors, as all food does, by traveling from the back of the throat up to the olfactory epithelium.

6.   The sense organs for smell sit at the top of the nasal cavity on a surface called the olfactory epithelium.

7.   The receptors poke out of the membrane of nerve cells in the lining, known as the olfactory epithelium.

8.   When you exhale, however, those same chemicals are blown up the nasopharynx into the waiting arms of the olfactory epithelium.