Genome-wide linkage analysis for the top 20 ICAtraits. In each linkage profile, the negative log p-value of the linkage statistic for each ICAtrait is plotted against the genomic position of all the markers. Significance is determined by a GWER < 0.05. Seventeen of the 20 ICAtraits show linkage to at least one QTL. Tolerance is set at 1E-10 for p-values equal to zero.