31.   The mutations are particularly helpful for reconstructing population history because each lineage of men has its own distinctive pattern of mutations.

32.   The odds of such a wide variety of particles accidentally arranging themselves in such a distinctive pattern are extremely low.

33.   The stickers are treated so that under a special light, a distinctive pattern appears.

34.   The stains showed a distinctive pattern, being scattered throughout the brain but most evident in the areas known as the basal ganglia, thalamus, and cerebellum.

35.   His works have a distinctive swirling pattern.

36.   Police found a bloody sweater with a distinctive pattern at a playground about a mile from where the body was found.

37.   The scientists had the mice perform specific tasks in a maze that produced very distinctive patterns of brain activity.

38.   The scientists had the rats perform specific tasks in a maze that produced very distinctive patterns of brain activity.