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Motility of a patient with a KIF21A mutation. He also has aberrant innervation causing a Marcus Gun jaw wink. Reproduced with permission from Yamada, Hunter, et al., “A novel kif21a mutation in a patient with congenital fibrosis of the extraocular muscles and Marcus Gunn jaw-winking phenomenon,” Arch Ophthalmol. 2005;123(9):1254–1259.
