51.   But even so, his group took elaborate precautions to prevent any contact between the ancient bacteria and the world outside their sealed culture dishes.

52.   But environmental groups take issue with these explanations.

53.   But Clinton said at his news conference here that Assad had privately criticized the bombing, for which the Islamic militant group Hamas took responsibility.

54.   But five years later, the same guerrilla group took over the Palace of Justice.

55.   But he said the group no longer took new Medicare patients, because the losses were unsustainable.

56.   But labor rights groups take a much dimmer view of the agreement.

57.   But other major religious groups have taken a different stand.

58.   But some in the medical establishment wondered Monday whether the groups were taking the right approach.

59.   But some new groups are taking the places of the old ones.

60.   But maybe both groups should take hope.