21.   The laboratory rat is valuable because it is widely used in medical studies and for pharmaceutical testing.

22.   The medication slowed the progress of the disease in laboratory rats, but a later human trial was not successful.

23.   The one intervention that is known to significantly prolong the life of laboratory rats and mice is to put them on diets with very few calories.

24.   They found that when laboratory rats were given components of the brew, they died in as little as two and a half minutes.

25.   This time, Hawkins will turn this shark into a laboratory rat while his family hits the slopes at Vail this Christmas.

26.   Usually the studies are pegged to the performance of laboratory rats.

27.   Using laboratory rats, Lane has been producing remarkable three-dimensional images of living bone and how osteoporosis depletes bone mass, making victims vulnerable to serious fractures.

28.   Dr. Morton Goldberg explained that the laser treatment had been effective in laboratory rats but had not yet been used on humans.

29.   I feel like a laboratory rat in a maze, resigned to the fate of running around mindlessly in circles before losing what little sanity I have left.

30.   In the study, the researchers induced strokes in a group of laboratory rats by cutting blood flow to specific areas of the brain.