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Boxplots displaying differences in TMS parameters in age- and sex-matched groups by BDNF polymorphism (Val/Val and Val/Met). A, Peak-to-peak (p-p) MEP amplitudes were lower in the Val/Met individuals compared to Val/Val; No differences were found in B, resting motor threshold or C, stimulation intensities between matched groups. mV = millivolts; %MSO = maximum stimulator output, n.s. = not significant. P-values reported from the Wilcoxon rank sum test.
