An active cell typically stays active for half a second to a few seconds.
A senior law enforcement official refused tonight to say how many active cells the authorities believe may still be operating inside the United States.
The officials have estimated that there are at least three active terrorist cells still in the kingdom, and perhaps as many as five.
One day there are too few active cells living too slowly.
Our friends like the idea of an active revolutionary cell in America.
According to Spanish police, the group has three active cells with each one consisting of four members.
Indeed, the Europeans have successfully uncovered and dismantled a number of active cells in their countries.
Four days later French police also arrested two suspects believed to be tied to the same active cell.
Unlike many other electrically active cells, the hair cell itself does not fire an action potential.
As they form into active isolated cells they make apprehension difficult.