MAPMAKER/QTL scans on chromosomes 13 and 17 for aberrant B-1 cell proliferation in blood of 127 to 140 (NZW x B10.NZW) F1 x B10.NZW backcross mice. Lod score curves (bold lines, 8 months of age; dotted line, 16 months of age) are shown on the right with scale on the top. Map positions of markers are arranged from centromere to telomere on the left side of the chromosome line. An “error” bar represents the one-lod support interval of Bpal-2. Candidate genes within the support interval are also listed.