SummaryFollowing segregation of the alleles at theSas‐1, LyM‐1andM1sin the (AKR/J x C3H/HeJ)F1x C3H/HeJ backcross progeny, we found the locus responsible for the lymphocyte alloantigen LyM‐1 to be closely linked toSas‐1andM1s. The map distances are estimated to be 12.5 ± 3.9 forSas‐1toLyM‐1, 6.9 ± 3.0 forLyM‐1toM1sand 19.4 ± 4.7 forSas‐1toM1s. These data clearly indicate that the gene order isSas‐1‐LyM‐1‐M1s
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