41.   Goodman is involved in one such study, called CARET, that is searching for a protective effect of beta carotene in smokers and asbestos workers.

42.   However, the possible protective effect of vitamin D in warding off osteoarthritis was seen at dietary levels that were two to eight times as high as the RDA.

43.   However, the protective effect seemed to disappear if they stopped taking the drug.

44.   In fact, knowing the details of a suicide and its aftermath seemed to exert a protective effect.

45.   In recent years such antioxidants have become widely used, even as a number of large studies failed to show any significant protective effect.

46.   Its protective effects have been shown to persist for at least five years after the drug is stopped.

47.   Ongoing studies are designed to learn whether starting drug treatment soon after infection occurs and then stopping it might allow the immune system to produce a similar protective effect.

48.   One possibility is that the hormone fragment has a general protective effect, stimulating the immune system and attacking viruses and other microorganisms that might attack a developing embryo.

49.   Scientists have long suspected that tea, which also contains catechins, may have a protective effect.

50.   She said the raloxifene results reported Tuesday showed that the protective effect is continuing through four years of followup.