41.   Other drugs may block the ability of cancer cells to spread to healthy cells outside the breasts.

42.   Oncologists have to deliver a dose high enough to kill cancer cells, but low enough so that healthy cells can recover from the bombardment.

43.   Price said nisin and lanthocin do not attack healthy human cells.

44.   ProstaScint uses a technology based on monoclonal antibodies, healthy cells that seek out diseased cells and deliver agents that help expose or treat the sickness.

45.   Richart says each company has taught its machine to distinguish sick from healthy cells by feeding it examples of each.

46.   Scientists say they have discovered how two important genes work together in a healthy cell and why cancer can form when these genes are defective.

47.   Retinal cell transplantation involves moving healthy retinal cells from an area of the eye not yet affected by RP into an area already in decline.

48.   Scientists think the stem cells might be able to replace diseased or hurt cells with healthy new cells.

49.   The dye washes off of healthy cells, which are tightly compacted.

50.   The gel coats the tumor, releasing the chemo slowly, concentrating its power while lessening its side effects on healthy cells.