| When the toxin is exposed to light, it reacts with oxygen to produce superoxide anions and singlet oxygen, which are also known as free radicals. |
| The third type of intervention is administration of cathartic agents to increase gastrointestinal motility and hasten the expulsion of the toxin. |
| The toxin also inhibits release of acetylcholine in all parasympathetic and cholinergic postganglionic sympathetic neurones. |
| One initial test conducted at the scene came back positive for the presence of ricin, a toxin made from the castor bean. |
| Curare, botulinum toxin, and organophosphorus insecticides each interfere with neural transmission. |
| He did not have a history of exposure to any known toxin, and he denied any alcohol or substance abuse. |
