Why the mutated proteins selectively kill only certain brain cells remains a mystery.

Her features were the precise sort that make you suspect old families of selectively killing their infants to improve the breed.

The tribe killed selectively, and always regarded the great beasts with respect.

Instead of mass killings, the paramilitaries have, for the most part, been selectively killing rebels.

Future treatment, he said, will involve drugs that selectively kill cells with a particular defect in a breast cancer gene.

So the virus tended to kill selectively, overcoming a general drawback of germ weapons.

In 10 or 15 years, computers will be able to design genetically engineered viruses that will selectively kill specific segments of a population.

The surviving scientists soon learn that they can selectively kill people by releasing the internal pressure of their cell membranes, among other things.

In theory genetic engineering could produce weapons that kill or cripple selectively by race and nationality.

It can kill selectively, from a safe distance.