1.  Cholesterol, an excess of which can block blood vessels, is actually a vital component of every living cell.

2.  The thin oil that coated each vital component, the enamel and metal tapes were warm enough to aromatize the air as fast as the air-conditioning changed it.

3.  They form a vital component of our defences against chemical attack from trace compounds found largely in our diet.

4.  Another would sabotage the part of the toxin that attacks a vital inner component of cells.

5.  As several leading economists have pointed out, Europe lacks vital components that make monetary union work in the United States.

6.  A great nation has an obligation to encourage and recognize the arts in all forms as a vital component of civilized life.

7.  All of us are guilty of taking state employees for granted, though they are a vital component of the area economy and really make state government work.

8.  Commander Barone and other women on the Pittsburgh force say the skills women bring to the job add vital components to policing.

9.  Federal agents in California quietly arrested a Chinese citizen last week and charged him with trying to obtain a component vital to missile guidance systems.