Figure 2.

Portions of the Y chromosome palindrome P6, sequenced in both human and chimpanzee. The white region is the 'spacer' separating the arms of the palindrome (the spacer is about 46 kb in length). The black regions are the arms of the palindrome. The numbers indicate the percentage sequence divergence, either between the arms of the palindrome within a species, or between homologous regions in humans and chimpanzees. (Modified from Figure 1 of [13].)