1.   Something in his voice seemed to penetrate her brain, having a calming effect.

2.   For instance, most AIDS drugs do not penetrate the brain well.

3.   She died later at a hospital, where X-rays showed a bullet had penetrated her brain.

4.   Several shotgun pellets penetrated her brain.

5.   Some of the current drugs cannot penetrate the brain efficiently, and researchers say cells in the brain are almost certain to remain latently infected with HIV.

6.   It can penetrate the brain -- giving it an anesthetic effect -- and thus might give better brain scans.

7.   The thrust was believed to be so severe that the guard lost his eye and the comb penetrated his brain, one source said.