11.   Killer cells are the cells of the immune system that attack tumor cells.

12.   One application scientists have proposed would be to attack cancer cells, guiding PAP to the target cells by attaching it to antibodies designed to home in on them..

13.   Once the organism gains access to the bloodstream, it can attack cells throughout the body.

14.   Or it might nudge T-cells to attack myeloma cells.

15.   Receptors are protein molecules that carry out various functions in cells and can sometimes be exploited by viruses or bacteria seeking to attack the cells.

16.   Salmon said the answer mostly likely will come from unraveling the genetic code and attacking cells at their most basic level.

17.   So if a tumor or virus makes a protein that also appears on brain cells, the immune system will hunt down and attack those cells as well.

18.   That will reduce the toxic effects of Taxol as it attacks cancer cells.

19.   The bacteria also will attack the cells lining the intestine, which is how it is able to invade other parts of the body and cause complications.

20.   The idea is to attack the cells that build capillaries, a network of fine blood vessels that nurture fast-growing tumors.