Download the entire AXB/BXA genotype file used in GeneNetwork (n = 2446 unique strain distribution patterns based on a total of 8514 informative markers). We have modified the orginal Wellcome-CTC genotypes by adding selected microsatellite markers. We have also curate the data and have removed somewhat improbable double-recombinant haplotypes and by imputing genotypes for a few untyped strains using very tightly linked markers. This genotype "smoothing" may remove some genuine recombinations and may result in linkage maps that will be very slightly conservative.