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Comparison of crossover landscape of chromosome 6 in the presence versus absence (P-vs-A) population (n = 1198) and presence versus presence (P-vs-P) population (n = 3786). All lines were isolated from the nested association mapping population. Green dash lines indicate the RegionA, gray blocks indicate the gaps near RegionA, red dots indicate the centromere region. a Whole chromosome 6. b A zoomed-in view of the region from 5 to 25 Mb
