Ricin

Castor beans The protein ricin (pronounced [ˈraɪsɪn]) is a toxin from the castor bean (Ricinus communis). Ricin can be extracted from castor beans and is known to have an average lethal dose in humans of 0.2 milligrams (1/5,000th of a gram), though some sources give higher figures [2]. It is considered to be twice as deadly as cobra venom. Toxicity and manufacture Ricin structure. The A chain is shown in blue and the B chain in orange. Ricin is poisonous if inhaled, inject ...