51.   The Harvard and North Carolina researchers found that healthy cells actually ingest Pseudomonas bacteria.

52.   The protein helps the bacteria enter healthy cells called macrophages, which normally kill invading bacteria, Sacchettini said.

53.   The promise of monoclonal antibody drugs is that they can be extremely selective, binding with specific targets while not affecting healthy cells.

54.   The process reinjects healthy immune cells removed from patients before the debilitating therapy begins.

55.   The potential significance of the research extends beyond leukemia because the compound targets only abnormal cells, leaving healthy cells undamaged.

56.   The theory behind donor bone marrow in treating osteogenesis imperfecta is to infuse the body with healthy cells needed to make stronger bones.

57.   The tissue can then be treated with laser energy calculated to destroy the newly vulnerable cancer cells while leaving healthy cells undamaged.

58.   There are also experimental treatments that use lasers or other heat to obliterate the abnormal cells and allow healthy cells to replace them.

59.   They also know how much radiation different types of healthy cells can absorb before they suffer unacceptable harm.

60.   This should allow potent drugs such as anticancer agents to be unleashed at tumor sites while sparing healthy cells elsewhere.