- Ricin is made of two protein chains linked by a disulfide bond. The A chain (blue) is an N-glycoside hydrolase that inhibits protein synthesis. The B chain (orange) is a lectin that helps ricin bind to a cell.AzaToth, Wikipedia Commons
- Castor beans (seeds from Ricinus communis) are the source of ricin, a deadly toxin.USDA-ARS