Ricin

Ricin is a highly toxic protein that is derived from the bean of the castor plant (Ricinus communis). The toxin causes cell death by inactivating ribosomes, which are responsible for protein synthesis. Ricin can be produced in a liquid, crystal or powdered forms and it can be inhaled, ingested, or injected. It causes fever, cough, weakness, abdominal pain, vomiting, diarrhea and dehydration and death. There is no cure for Ricin poisoning, and medical treatment is simply supportive.