Figure 4.

Map location of the xenotropic/polytropic receptor gene on mouse Chr1. The map represents a 10-centimorgan segment of the distal end of Chr1. The entire Chr1 has a length of ≈107 centimorgans. To the right of the map are recombination fractions between adjacent loci, with the first fraction from the M. musculus musculus crosses and the second from M. spretus crosses. The numbers in parentheses represent recombinational distances ± standard errors. Marker loci were typed as previously described in this cross [C. A. Kozak and C. E. Buckler, Mouse Genome Database, Release 3.2, Mouse Genome Informatics, The Jackson Laboratory (http://www.informatics.jax.org/crossdata); ref. 38). The M. spretus crosses were not typed for Lamc1. Gene order was established by minimizing the number of recombinants. One single locus double recombinant involving Cchl2a was identified in the M. spretus crosses that is not included in the figure.