11.   The mice were created in an experiment designed to assess how memories are formed in the mammalian brain.

12.   The smarter mice were created by a team of researchers led by Dr. Joe Z. Tsien, a neurobiologist at Princeton University.

13.   These cells were then introduced into a surrogate mother to create mice carrying the deficient gene, he said.

14.   Until now, scientists had been able to create mice missing a key gene, but the animals lacked the gene in every cell where it was normally active.

15.   You have undoubtedly read the stories about how genetic researchers have created a mouse that can eat all it wants and not gain weight.

16.   In the experiments, researchers created mice bearing a gene that let them produce human growth hormone.

17.   In the new study, scientists created mice that lacked one of the four kinds of adenosine receptors.

18.   Scientists have created mice that show an ALS-like disease, which should allow for rapid testing of possible treatments, he said.

19.   Researchers led by Javier Martinez-Botas from Baylor College of Medicine in Houston, Texas, created mutant mice that lacked a gene for a protein called perilipin.

20.   The first mice were created by inserting a human detoxifying gene into fertilized eggs which were then implanted into a female mouse.