|  | Definition: |  | A highly poisonous protein  found in the seeds of Abrus  precatorius, the rosary pea.  Abrin is toxic because it inhibits  protein synthesis, causing symptoms such as internal bleeding, intestinal  upset, and the irritation of mucous membranes.  It was formerly used to  treat some chronic eye disorders and it is currently being researched as  a potential chemotherapy drug. |