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Figure 1 Pedigrees of families with a PKP2 mutation. Circles and squares indicate women and men, respectively. Filling in the circles/squares indicates the phenotypes of individuals: white = unaffected; black = affected; blue = fulfill an incomplete set of task force criteria; and red = inadequate clinical information available. + indicates the presence of a PKP2 mutation and – indicates the absence thereof. Arrowhead indicates the proband of the family. Slanting bar indicates a deceased individual.