Cell nucleus
Jump to navigation
Jump to search
![](http://s9.addthis.com/button1-share.gif)
The cell nucleus is the membrane-bound region in the center of a cell that contains the cell's genetic material. This genetic material is in the form of chromatin, a complex of DNA and various "spool" proteins. An apparent structure inside the nucleus is a darker region called the nucleolus, which is the site where ribosomes are assembled.