
Major regions of homology between the human X and Y chromosomes. For the XY homology region, the asterisk (*) and the arrow represent marker order differences between the X and Y by comparison of the physical map of the Y chromosome (see text) to the map of the X chromosome presented here. The asterisk represents the region surrounding DXYS1, and the arrow represents the general order of 33 markers (sY20–sY52). (XpPAR) Xp pseudoautosomal region; (XqPAR) Xq pseudoautosomal region.











