The proximal Chr 1 QTL associated with marker rs13476229 was examined in additional detail. As noted in Table 1, the haplotype for this SNP was LP:B6=D2=C. The Mouse Phenome SNP database (www.jax.org/phenome/snp.html) was queried for the distribution of SNPs with this haplotype over the interval from 160 to 180 Mbp. The number of SNPs that had data for all four strains was small (N=295), primarily due to the lack of data for the LP and C strains. However, the data suggested that the LP:B6=D2=C haplotype was found only between ~170 and 173 Mbp. Substituting the closely related (see Beck et al. 2000) 129S1/SvImJ (129) and the BALB/cByJ (CBy) strains for the LP and C strains, respectively, and focusing on the region between 168 and 178 Mbp, 7449 SNPs with the haplotype of interest were reported. Only one of these SNPs was found in the interval between 168 and 170 Mbp, and only 16 were found between 173 and 178 Mbp. The 170- to 173-Mbp interval is a relatively gene-poor region, containing only 20 known or predicted genes. These are Pbx1,
