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Intrafamilial variability of disease expression in the K705fsX712 RP1 mutation. A. Visual field tests recorded in a normal individual, patient II-1 at the age of 72 years and III-3 at the age of 40, carrying the mutation. B. Electroretinographic recording in a normal individual and in patient II-1 at the age of 72 years still showing response of the rods and cones while in patient III-3 the ERG was abolished (not shown).
