This represents the third slide in a series highlighting the history, chemistry, and uses of ricin, a highly toxic poison made from castor beans. The slide, entitled, “Castor Bean Toxins”, states that ricin, a cytotoxin, and Ricinus communis agglutinin, a hemagglutinin, are two toxins derived from castor beans. It has been determined, that “ricin is several times deadlier than cobra venom”. Ricin is now sometimes used as an agent of bioterrorism. This presentation is copyrighted by Dr. Jonathan Burstein, MD, Anthony J. Carbone, MD, MPH, of the Harvard Center for Public Health Preparedness, Harvard School of Public Health.