You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <alltransclusions gatcontinue="Sequence|94397" />
  </query-continue>
  <query>
    <pages>
      <page pageid="94387" ns="0" title="Sequence 1 (H1)" />
      <page pageid="94388" ns="0" title="Sequence 2 (LZR-12 , LZR12)" />
      <page pageid="94389" ns="0" title="Sequence 3 (LZR-13 , LZR13)" />
      <page pageid="94390" ns="0" title="Sequence 104 (CLSTR12038r1 cieg021m05 175)" />
      <page pageid="94391" ns="0" title="Sequence 167 (SP-1113 , SP1113)" />
      <page pageid="94392" ns="0" title="Sequence 133 (CLSTR07431r1 cieg010d01 145)" />
      <page pageid="94393" ns="0" title="Sequence 109 (CLSTR07753r1 ciad046i23 151)" />
      <page pageid="94394" ns="0" title="Sequence 197 (siARHGEF12.1)" />
      <page pageid="94395" ns="0" title="Sequence 119 (CLSTR07626r1 cieg023k03 148)" />
      <page pageid="94396" ns="0" title="Sequence 237 (siSARS-23 , siSARS23)" />
    </pages>
  </query>
</api>