diagram of an <a href="https://en.wikipedia.org/wiki/cell_nucleus" class="extiw" title="w:cell nucleus">cell nucleus</a>:
<dl><dd><b>1.</b> Nuclear envelope.</dd>
<dd><b>1.a.</b> Outer membrane.</dd>
<dd><b>1.b.</b> Inner membrane.</dd>
<dd><b>2.</b> Nucleolus.</dd>
<dd><b>3.</b> Nucleoplasm.</dd>
<dd><b>4.</b> Chromatin.</dd>
<dd><b>4.a.</b> Heterochromatin.</dd>
<dd><b>4.b.</b> Euchromatin.</dd>
<dd><b>5.</b> Ribosomes.</dd>
<dd><b>6.</b> Nuclear pore.</dd></dl>
original version by <a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">Mariana Ruiz</a>.<br>numbered version by <a href="//commons.wikimedia.org/wiki/User:LipeFontoura" title="User:LipeFontoura">Felipe Fontoura</a>.
2007-05-22
<a href="//commons.wikimedia.org/wiki/File:Diagram_human_cell_nucleus.svg" title="File:Diagram human cell nucleus.svg">File:Diagram human cell nucleus.svg</a>