1.   -- Behavioral tests.

2.   But David Gems, a British geneticist, found enough males of a species called Caenorhabditis elegans to run some intriguing behavioral tests.

3.   But when a more difficult behavioral test was given, a preference was evident.

4.   Researchers administered a battery of behavioral tests at intervals of one day, one week and four weeks after the treatment.

5.   When the babies were born, they recognized the verse, distinguishing it, in behavioral tests that involved sucking, from a book without rhymes.

6.   With apologies to comedian Jeff Foxworthy, the P-I offers a behavioral test to determine which side most fits your personality, should you have one.

7.   The researchers used behavioral tests, including placing females in a maze, to show that the chemical is a sexual lure.