But the law was the law, and researchers kept studying it.

The researchers keep in close touch with these men.

To determine whether that occurred, the researchers kept studying the women.

The researcher at the first company kept his job.

Still, cloning technology is potentially highly useful, so researchers keep trying.

On average, the researchers kept track of each participant for about 20 years.

The researchers then kept track of the patients for two months to see how symptoms progressed and to ask about side effects.

The researchers could chase up forms, and keep the motivation going even when team members were hard pressed.

The researchers keep trying, but the best defense thus far appears to be a tall solidly built fence.

The researchers kept track of the subjects for two years.