Detail of a human metaphase spread. A region in the pseudoautosomal region of the short arms of the X- and Y-chromosome (PAR1) was detected by fluorescence in situ hybridizaton (green). Chromosomes counterstained in red.
Steffen Dietzel, <a href="//commons.wikimedia.org/wiki/User:Dietzel65" title="User:Dietzel65">Dietzel65</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>