41.   They died much sooner than normal mice.

42.   They flailed about in a pool of water while trying to find their way back to a submerged platform whose location normal mice could easily remember.

43.   Unlike normal mice, these can be infected with human CJD.

44.   Unlike normal mice, they do not seem to get cancer.

45.   When put through a battery of tests, the mice with the inserted genes turned out to have superior ability in learning and memory compared with normal mice.

46.   Within moments of giving birth, normal mice make nests, gather their pups together, crouch over them to keep them warm, lick and suckle them.

47.   After breeding mice without this gene, the researchers infected them and a group of normal mice to the influenza virus and the Coxsackie virus.

48.   Analysis showed they had an aversion to it, just the opposite of normal mice.

49.   And even normal mice experienced a steep loss of body fat, he said.

50.   But when normal mice are used to make antibodies, they produce versions that the human body attacks as foreign.