<p><br />

</p>

<p><a id="Types" name="Types"></a></p>

<h2><span class="mw-headline">Types</span></h2>

<h2><span class="mw-headline">External links</span></h2>

<ul>

<li><a class="external text" title="http://www.dnai.org/" rel="nofollow" href="http://www.dnai.org/">DNA Interactive: The History of DNA Science</a> </li>

<li><a class="external text" title="http://www.dnaftb.org/" rel="nofollow" href="http://www.dnaftb.org/">DNA From The Beginning</a> </li>