1.   In that way it resembles a hormone, a body chemical such as estrogen, that produces different effects.

2.   Scientists have found a body chemical that naturally fights the tuberculosis bacterium.

3.   Scientists have harnessed a natural body chemical that allows damaged hearts to sprout their own bypasses, researchers says.

4.   The idea is to block asthma-trig gering leukotrienes, the natural body chemicals implicated in asthmatic wheezing, coughing and shortness of breath.

5.   The patient had a hunch that the drug might be helpful because it suppresses a body chemical that is elevated in ALS patients.

6.   Cancer cells may carry four closely related versions of this signal receiver, and they can be turned on by at least a dozen different body chemicals.

7.   Neufeld knew other scientists had discovered that excessive levels of a body chemical called nitric oxide can be toxic to certain tissues.