1.   As a result, a foreign substance from the refueling tank was able to be introduced into the helicopter when it was refueled, the source said.

2.   Because the intestines are normally barraged by foreign substances and microbes, they are rich in immune-system cells meant to defend against invaders.

3.   But most foreign substances were believed to have entered drugs during the packaging process.

4.   Cubs first baseman Mark Grace handed it to plate umpire Ed Montague during the changeover, and Kim was promptly ejected for using a foreign substance.

5.   Guerrero was ejected in the first inning after umpires noticed the foreign substance in his broken bat.

6.   Many of them were children when they got the first polio shots using a preventative vaccine that primes the body to keep out foreign substances.

7.   Recent vaccines, for example, have succeeded in prompting the body to generate antibodies, which are proteins that combat germs, viruses and other foreign substances.

8.   Researchers already knew how to force tiny molecules to bind to larger ones to create a big foreign substance the immune system could not miss.

9.   Some folks insist on tainting a perfectly good chicken-fried steak with ketchup, Tabasco sauce, steak sauce or other foreign substance.

10.   Tests revealed that volunteers who used the vitamin supplements for several months mounted stronger immune responses to foreign substances than did those who took the placebo.