SpaFinder is followed by Hybrigen , which plans to identify and patent cancer-fighting proteins by improved tracking of chemical behavior near the tumor.

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In humans, no one has identified analogous chemical compounds that serve as signals or prompt behavior in these ways, Wysocki said.

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Serotonin is a chemical released in the brain that can affect mood and behavior.

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Seeing this made me wonder if the behavior of smoking might be as addictive as the chemical gratification of lighting up.

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Dr. Schneider points out that the drug Dimebon bears some chemical similarity to various antidepressants and anti-psychotic drugs that improve behavior.

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Daniel Schultz, the FDA's chief device regulator, says new medical devices don't need the large-scale exhaustive trials of the drug industry because it is easier to predict the behavior of a machine than it is to track the chemical interactions of a new drug in the body.

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