Distribution of plasma VWF levels as a function of F2 genotype at the significantly linked marker D6Mit12. VWF levels in mice homozygous for the A/J allele at D6Mit12 are represented by the open bars with the open triangle representing the mean value for this population (error bars represent the 95% confidence interval). Similar distributions are shown in gray for mice heterozygous at D6Mit12 and in black for mice homozygous for the CASA/RkJ allele.