1.   But, on the basis of currently available evidence, uncertainty remains.

2.   Collins and Brown scotch that notion, but uncertainty remains whether inserting an implement into the premises is sufficient.

3.   The Chancellor cautioned that uncertainties remained, however.

4.   Although the protests were calm, financial markets fell to new lows as political uncertainty remained.

5.   Although most political analysts had agreed that the treaty seemed likely to be approved, uncertainty remained over the margin of victory.

6.   And there remains some uncertainty over the long-term effects of freezing cord blood.

7.   A Clinton administration official said that a White House ceremony was possible but that uncertainties remained.

8.   Almost all scientists agree that prolonged exposure to high levels of radon is hazardous, but uncertainty remains about the risks of low-level exposure.

9.   But a key uncertainty remains for those farmers and their neighbors to the north.

10.   But even as new approaches show promise, much uncertainty remains about which patients, if any, are likely to benefit from specific treatments.