11.   Armed with special enzymes, it splices its own genes into the immune cells it infects, turning them into factories for producing more HIV.

12.   At high concentrations, cholesterol burrows into blood vessel walls where it attracts immune cells that feed on it.

13.   Because immune cells are also negatively charged, they and the embryo repel each other like matched pairs of magnets.

14.   Being able to use those immune cells could also have implications for fighting infections, and for preventing rejection of transplanted organs and tissue.

15.   Besides the so-called viral load, the outlook for a patient with HIV or AIDS is assessed by measuring the number of healthy immune cells found in their blood.

16.   According to the paper, a wide variety of properly functioning immune cells resulted.

17.   After several days the researchers looked for signs that the immune cells had been infected.

18.   But an antibody response is thought to be powerless against another source of virus, which hides itself in immune cells.

19.   But after three hours, the immune cells return to normal levels, Dhabhar said.

20.   But it is meant to trigger the body to produce a certain kind of immune cell that kills cells infected with HIV, the virus that causes AIDS.