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<h2>Chromatin - Histone protein / DNA complex in eukaryotic cells</h2>
<p>Basic Unit - nucleosome - 146 bp of DNA wrapped around an octamer of the four core histones (H2A, H2B, H3 and H4)</p>
<ol>
<li>Euchromatin - transcriptionally active state - the region where DNA is accessible due to the relaxed state of nucleosome arrangement</li>
<li>Heterochromatin - transcriptionally inactive state - the area where DNA is packed into highly condensed forms that are inaccessible to transcription factors</li>
<li> </li>
</ol>
<p> </p>
<p> </p>
