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Individual values (circles) and means (lines) for the P50 ratio. Control subjects with a variant allele had a significantly higher mean P50 ratio than control subjects with the common alleles. Likewise, schizoaffective, bipolar type subjects with a variant allele had a higher mean P50 ratio than those subjects with the common alleles. SZAD = Schizoaffective, bipolar type; Common = common CHRNA7 promoter region alleles; Variant = variant CHRNA7 promoter region alleles.
