me number where each gene is located. A numeric vector.</p></dd>

  <dt>start</dt>
<dd><p>Start positions of the genes on the chromosome. A numeric vector.</p></dd>

  <dt>end</dt>
<dd><p>End positions of the genes on the chromosome. A numeric vector.</p></dd>

  <dt>strand</dt>
<dd><p>-1 for reverse and 1 for forward.</p></dd>

  <dt>cluster</dt>
<dd><p>Cluster identification as a character vector,
  specifying the HOX gene cluster (HOXA, HOXB, HOXC, HOXD).</p></dd>

  <dt>name</dt>
<dd><p>Simplified names