Castor oil is a vegetable oil pressed from castor beans. Oilseeds such as rapeseed, mustard, linseed, soybean, castor, and sesame are grown on nearly . Ricin is synthesized in the endosperm of castor oil plant seeds. Hydrogenation of castor oil saturates the alkenes, giving a waxy lubricant. Sebacic acid is a derivative of castor oil. The production of lithium grease consumes a significant amount of castor oil. An example is ricin, an extremely potent protein toxin found in castor oil beans. Undecylenic acid is prepared by pyrolysis of ricinoleic acid, which is derived from castor oil. It is a weaker laxative than bisacodyl or castor oil. A deadly poison, ricin, comes from seeds of the castor bean. They are most likely the twins Castor and Pollux. Bioplastic plant sources included kenaf fibers and castor seeds. Some parents punished children with a dose of castor oil. Gemini is represented by the twins Castor and Pollux, known as the Dioscuri. The allergen is not present in the castor oil itself.