11.  Some plants and microbes have already evolved natural defenses that inhibit quorum sensing.

12.  The research will focus on apoptosis, the process by which the body uses its natural defenses against injured or damaged cells.

13.  The Swiss Army withdrew from its borders, and regrouped in the Alps, which cut across the country, providing a natural defense line.

14.  Their prey lack the usual natural defenses.

15.  They say the boy evidently fought off infection with HIV, the AIDS virus, through the action of his natural immune defenses and apparently was only transiently infected.

16.  They say the boy evidently fought off the HIV infection with his natural immune defenses.

17.  Three provocative new studies by HIV co-discoverer Dr. Robert Gallo suggest that the body has its own natural defense against the virus that causes AIDS.

18.  When AIDS researchers discovered a new natural defense against the human immunodeficiency virus this month, they stumbled on a paradox.

19.  EDP also argues that the water will protect -- not harm -- the carvings by acting as a natural defense against vandals.

20.  For now, the front line is largely defined by the Terek River, which flows across the northern third of Chechnya, forming a natural defense barrier.

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