                                      <span class="stringliteral">&#39;PPS&#39;</span>,  <span class="comment"># 3&#39;-phosphate-adenosine-5&#39;-phosphate sulfate</span></div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;                                              <span class="stringliteral">&#39;TPO&#39;</span>,  <span class="comment"># phosphothreonine</span></div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;                             