11.   The company also said it had no evidence that the protein would cause allergic reactions in humans.

12.   The injury is caused by proteins that normally fight viral infections.

13.   The prion theory is quite controversial, with biologists split on whether the rogue proteins can cause disease by themselves.

14.   The question that confronted regulators was whether this protein could cause allergies.

15.   This nerve-silencing protein causes a paralysis that can stop a person from breathing and halt his heartbeat.

16.   Endothelial cells line blood vessels, and by attacking them the protein caused the vessels to leak, the researchers said.

17.   In laboratory mouse studies, these proteins cause tumors to shrivel and even disappear.

18.   Mad cow disease, known formally as bovine spongiform encephalopathy, or BSE, is believed to be caused by proteins gone awry.

19.   The corn has been approved for animal feed but not for human consumption due to concern that the protein might cause allergic reactions.

20.   The disease may not be due to prions, but understanding how proteins can cause disease could point researchers in the right direction, he said.