While many drugs that attack single genes have hit the market recently, they often have been used indiscriminately in all patients with a single tumor type.

FORBES: Magazine Article

Today it has just nine, so a single problem with one type could affect a large fraction of the nuclear arsenal.

CENTERFORSECURITYPOLICY: Center for Security Policy | Politics and the Test Ban Treaty, By George F. Will, Newsweek, 20 October 1999

If you had CV-22 type technology, could have been done with a single in-and-out pass -- albeit with helicopter refueling with C-130 type assets -- moving directly into the objective area, and then being able to extract during that, again, single period of darkness.

CENTERFORSECURITYPOLICY: V-22: A discussion on the way ahead

In a series of animal experiments published over the past year, university-based neuroscientists genetically engineered mice and monkeys with different types of neurons primed to be uniquely responsive to shades of laser light, so that a single type of activity or behavior could be altered instantly without affecting anything else.

WSJ: Scientists Cast Light Onto Roots of Illness Deep in the Brain