31.   Microscopic studies showed the virus attacked cancer cells but caused no infection in normal, healthy brain cells, he said.

32.   The concern is that the immune system might attack cells that take up the gene, interfering with the therapy.

33.   The synthetic protein, called raspeptid, is virtually identical to parts of cancer cells, so the protein helps T-cells recognize and attack malignant cells.

34.   When it infects, the bacteria produces a toxin, or poison, that attacks cells.

35.   According to the reports, Moore died of a rare disorder that attacks brain cells known as progressive supranuclear palsy.

36.   The combination attacks the virus at the time it exits an already infected cell in preparation for attacking other cells.