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Irukan is a type of Sangheili grain. The UNSC Office of Naval Intelligence made a strain of Irukan that was poisonous to consume. Dr. Magnusson planned to use it against Sanghelios but Margaret Parangosky decided it was too risky as it could be accidentally used against the UNSC on similar human crops. The first testing of the poisonous crop strain's effectiveness on a Sangheili was conducted on Jul 'Mdama during his imprisonment by ONI personnel on ONI Research Facility Trevelyan.