11.   When exposed to allergens, our immune system treats them like invaders and releases antibodies known as immunoglobulin E, or IgE, to fight the perceived enemy.

12.   With other so-called Afghan Arabs, he emerged from that conflict a hardened veteran, dedicated to a borderless, almost apocalyptic war against the perceived enemies of Islam.

13.   But its defense plans against its perceived enemies, China and North Korea, include the US nuclear umbrella.

14.   In October, Doerty ordered Trummel to remove from the addresses, phone numbers and any other personal identifying information about his perceived enemies.

15.   Meanwhile, officials were allegedly consolidating a crew of ultra-nationalist thugs and criminals to intimidate perceived enemies of the state.

16.   Muslim extremists praise suicide bombings against perceived enemies such as Israel and the United States.

17.   Speakers at the meetings tend to condemn the United States, Israel and other perceived enemies of Islam.

18.   Such rallies tend to condemn the United States and other perceived enemies of Islam.

19.   The White House tapes, made public Tuesday by the National Archives, show a worried Nixon crafting a strategy to attack perceived enemies.

20.   But hearing them from perceived enemies is one thing, and hearing them from those perceived as friendly is a much less bitter pill.