Haplotype map of (BALB/cJ × BXH-2)F2 mice for the central portion of chromosome 8. Each column represents a chromosomal haplotype in (BALB/cJ × BXH-2)F2 mice, with the total number of animals bearing this haplotype indicated at the bottom (n). For genetic markers D8Mit86, 200, 13, and 326, homozygosity for either C57BL/6J (▪; BXH-2 derived), or BALB/cJ (□), or heterozygosity (◥) is identified. The presence (▪) or absence (semi-hatched boxes) of splenomegaly (Myls) is shown. Haplotypes showing one recombination or 2 recombination events in the D8Mit86 to D8Mit326 are shown to the left and to the right, respectively.