1.   Both scientists caution, however, that those other chemicals may have other flaws.

2.   But National Aeronautics and Space Administration scientists cautioned that it is not yet clear whether the ice is concentrated enough to be easily mined by future astronauts.

3.   But scientists caution that the studies must be tried on hundreds more patients to validate them.

4.   But some scientists caution that an occasional dessert made with tobacco sauce or tobacco cream might make a nonsmoker sick.

5.   But there was no sign, federal scientists cautioned, that the anthrax seen thus far had the properties of an effective biological weapon.

6.   Even then, many food scientists cautioned against over-reacting.

7.   In an accompanying article, several scientists cautioned that there could be other explanations of the gravity measurements and that it would be difficult to test which was correct.

8.   Other scientists cautioned that it was premature to coin new names and more classifications for the objects.

9.   Other scientists cautioned that the clinical relevance of the finding was far from clear.

10.   Other scientists cautioned that there have been few peer-review studies on the effect of supplements and amino acids in enhancing the performance of elite athletes.