21.   Both Fischbeck and Rothstein urge caution, however.

22.   Across the continent, newspaper editorials have also urged caution, citing the complex nature of terrorism.

23.   But an influential European business representative urged caution.

24.   But because the potential importance of the discovery is so huge, scientists are still urging caution.

25.   But currency and market risks remain high and advisers with a global vision urge caution in Mexico.

26.   But Daley and Christopher, among others, again urged caution.

27.   But Daley, Christopher and others again urged caution.

28.   But Dr. Norman Fost, an ethicist at the University of Wisconsin who is a visiting professor this year at Princeton University, urged caution.

29.   But experts urged caution for several reasons.

30.   But Greenspan is correct in urging caution.