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Notes: A small island of the coast of Scotland owned by Moira MacTaggert and the site of her Muir Island Genetic Research Center. Muir is the preeminent center for the study of mutations in the world. It was also the site of the beginning of the battle with Proteus, and the battle with the Shadow King, who destroyed half the island before his defeat. Muir was also used as Excalibur's base of operations from immediately after the wedding of Cyclops and Phoenix until the team disbanded. In years past, Muir has also served as a containment center for dangerous mutants, including Proteus himself, an infant Magneto, Spoor, and Unus. The Center was leading the research of the Legacy Virus, until it was blown up by Mystique and the Brotherhood during a battle in which Moira was fatally wounded.