>
        <li>There is a more complex type of data called <em>paired-end</em>, which we will ignore in this presentation.</li>
    </ul>
  </div>
  <div class="slide">
    <h2>Mapping to a Reference is a Primitive</h2>
    <ul>
    <li>Mapping means <em>given a reference</em> and a <em>read</em>, finding
the read in the reference.</li>
    <li>For example, take the read
<tt>GCACATCCAGGCTGGTCAGTGTGGCAACCAGATCGGTGCCAAGTTCT</tt>
    <li>We can
computationally find it in the human genome (chromossome 6, in the 