51.   In the second experiment, the scientists infected mice with brain tissue taken from mad cows.

52.   Instead, he examined chunks of brain tissue, leaving open the possibility that he may have inadvertently disregarded the brain tissue that had the prions.

53.   Instead, investigators inoculate animals with brain tissue from infected animals, tissue that contains prions but that may also contain viruses.

54.   It is believed that all the victims contracted the disease from eating cattle infected with mad cow disease, a uniformly fatal malady that slowly destroys brain tissue.

55.   It seems that consuming squirrel brains can transmit to humans a fatal variant of mad cow disease, which essentially shreds human brain tissue.

56.   Levitt began by extracting genetic material from brain tissues taken from six schizophrenics at death.

57.   Like an invincible army of soldiers, it advances through brain tissue, leaving spongy holes behind.

58.   Light reflected off brain tissue is picked up by other helmet cables attached to sensors.

59.   Mad cow disease, formally known as bovine spongiform encephalopathy, or BSE, leaves brain tissue spongy and full of holes.

60.   Medtronic will also study long-term effects of electrical stimulation on brain tissue.