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Paternal transmission of the expanded allele (blackened circle) (n=15) results in a greater degree of intergenerational changes than does maternal transmission (unblackened circle) (n=8) (paternal change: 247±1,555 repeats; maternal: 0±28 repeats P<.01). Paternal transmissions gave rise to both elongations and contractions of the expanded alleles. Ovals and error bars indicate means and SDs, respectively.
