But as he runs for re-election, he is showing a distinct strain of caution.

Over sixty distinct strains with different pathogenetic potentials have been isolated.

There are several distinct strains of the virus.

But there is something interesting about them: the three distinct strains of Clinton criticism they represent.

But there are two distinct strains in the family.

In life sciences, "viruses" generally refers to several distinct strains or species of virus.

The pressures of human and natural selection have resulted in many distinct strains adapted to unique niches within the ecosystem.

Although they are the same species, the salmon from each river are distinct strains.

As a result, at least two distinct strains of thought advocated war with Serbia, often unified in the same people.

Drugs will be more effective, tailored to the individual and to a wider array of ailments, as diseases are broken down into distinct strains.