81.   The tiny device -- smaller and thinner than a strand of hair -- combines a healthy human cell with an electronic circuitry chip.

82.   Those forms proved toxic to healthy cells in laboratory cultures, he said.

83.   This means they could be coaxed to become new, healthy cells to rejuvenate, restore and repair ailing hearts, livers, brains and other organs.

84.   Using healthy cells cloned with the same DNA of a patient could make difficult organ and tissue transplants much easier, Atala said.

85.   Fraser said EE was activated in a natural process known as apoptosis, where unwanted, decaying cells are broken down and engulfed by adjacent healthy cells.

86.   The older drugs attack the virus when it penetrates a healthy cell.

87.   The drug, currently under evaluation by the US Food and Drug Administration, prevents viral replication by binding to healthy cells in the body, Hayden explained.