51.   But he said his department has not done a study on how canals specifically have contributed to wetland loss.

52.   But he said it was too early to recommend estrogen as a treatment for postpartum depression until more studies were done.

53.   But four months ago, state officials hired a consulting firm to do a study of the tunnel option.

54.   But it is a truism in cancer research that such spectacular findings do not hold up when larger, carefully controlled studies are done.

55.   But only one study has been done on Oatrim, and while the study indicates that Oatrim can lower cholesterol levels, the evidence is not conclusive.

56.   But she has done further studies of urban, Hispanic and African-American children and found a higher prevalence of sleep problems.

57.   But the college was a good one, the East China Normal University in Shanghai, and he decided to do doctoral studies in the United States.

58.   But the money evaporated, and no study was done.

59.   But those studies were done in animals.

60.   But the researchers who did the study maintain that the doses used were realistic because cells can accumulate this chromium compound and hang onto it for many years.