Recreating such a dangerous organism is not an experiment to be undertaken lightly.

In turn, that would make it easier to identify any dangerous new organisms that come from an act of bioterrorism.

Stigma is a series of highly dangerous man-made organisms.

What can go wrong by working to make two dangerous organisms live happily together?

It's a very dangerous organism, possibly a harbinger of a much larger threat.

Krypton's primordial era produced some of the most dangerous organisms in the universe.

Others said it would spur researchers to be more careful in handling dangerous organisms.

But unfortunately, some foods can appear perfectly good even when they are full of dangerous organisms.

But critics expressed concern that future experiments, if not carefully regulated, might unleash more dangerous organisms.

Those who favor strict regulation say the rules are too weak to prevent the release of possibly dangerous organisms.