MUGAmaps                Array annotation information for the mouse MUGA
                        arrays in mouse genome build 39.
coxmap                  Mouse genetic map based on Cox et al.
                        doi:10.1534/genetics.109.105486
                        <https://doi.org/10.1534/genetics.109.105486>,
                        revised for mouse genome build 39.
cross2_to_grcm39        Convert a cross2 object to use mouse build
                        GRCm39
grcm39_chrlen           Mouse chromosome lengths in basepairs for build
                        GRCm39
mmconvert               Convert mouse genome positions
