1.   Direct mail pieces play a critical role in Marketing campaigns.

2.   Here on the tongue, ion channels play a critical role in our sense of taste.

3.   It was supposed that the critical role of knowledge work in this new style enterprise would necessitate the restructuring of administrative systems.

4.   It will recognize the critical role of that Treaty in ensuring military security and stability.

5.   Leigh, who plays the critical role, inhabits the part.

6.   The critical role here belonged to the Social Democratic party.

7.   Work from sev-eral laboratories has suggested that emotional arousal plays a critical role in memory.

8.   The War Advertising Council, a private, non-profit organization, was founded to rally support for World War II-related efforts.

9.   Recently, PCNA, an auxiliary protein of DNA polymerase-delta, has been shown to play a critical role in the initiation of cell proliferation.

10.   Even though most of these reforms benefited from widespread political and public support, de Gaulle had played a critical role in bringing them to fruition.