a name="l00210"></a><span class="lineno">  210</span>&#160;                                              <span class="stringliteral">&#39;HEM&#39;</span>,  <span class="comment"># protoporphyrin ix containing fe</span></div><div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;                                              <span class="stringliteral">&#39;GMP&#39;</span>,  <span class="comment"># guanosine</span></div><div class="line"><a name="l00212"></a><span class="lineno">  212</