tr>
      <th>possibleOrigins</th>
      <td><p>Taxonomic identifiers of possible origin species</p></td>
    </tr>
    <tr>
      <th>possibleTargets</th>
      <td><p>Taxonomic identifiers of possible target species</p></td>
    </tr>
    <tr>
      <th>returnAllPossible</th>
      <td><p>if TRUE returns all possible pairings with non zero gene matches. If FALSE (default) returns the best match</p></td>
    </tr>
    <tr>
      <th>db</th>
      <td><p>Homologene database to use.</p></td>
    </tr>
    </