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Part of sheep chromosome 20 showing the MHC (indicated by box) and the names and locations of the microsatellite markers used in this study. Genetic distances and nomenclature are taken from Crawford (35). DIS*, the within cohort component of linkage disequilibrium adjusted for heterozygosity, and significance levels of linkage disequilibrium between neighboring pairs of markers in the St. Kilda Soay sheep population (55) also are shown.
