With the hunt for the members of the Sinestro Corps becoming one of the Green Lantern Corps' highest priorities, many of those who wield yellow power rings have been incarcerated in Oa's Sciencells, with their power rings stored in the large chamber that houses the entire detention facility. Sinestro has been shown to have chewed a very large hole in his finger, and he used his blood to paint the insignia of the Sinestro Corps on his cell window. All Sinestro Corps members followed his example, with the result of thousands of emblems across the cosmic jail. When Sinestro formed his insignia from blood, the power rings stationed on Oa seemed to react violently, threatening to break free of their confines.