
Eleven human genes residing within the most distal band of the human X chromosome (Xp22.3, left) are comparatively mapped in mouse, so far. The approximate physical distances of the human genes from the telomere (Xptel) are given at left. None of the genes localized in the human pseudoautosomal region (PAR1, shown in gray) are linked to the sex chromosomes in mice. The genes from within the X-specific portion of Xp22.3 are spread over the entire murine X chromosome. Mouse homologs for the human ANT3, ARSE, D, andKAL genes have not been identified. The asterisk denotes the different localization of Clcn4 in M. spretus andM. musculus.











