Ribbon diagram of human <a href="https://en.wikipedia.org/wiki/cytochrome_P450_oxidase" class="extiw" title="w:cytochrome P450 oxidase">cytochrome P450</a> <a href="https://en.wikipedia.org/wiki/isozyme" class="extiw" title="w:isozyme">isozyme</a> <a href="https://en.wikipedia.org/wiki/CYP3A4" class="extiw" title="w:CYP3A4">3A4</a>. <a href="https://en.wikipedia.org/wiki/heme" class="extiw" title="w:heme">Heme group</a> visible at center.<br>Created using <a rel="nofollow" class="external text" href="http://www.accelrys.com/products/downloads/ds_visualizer/index.html">Accelrys DS Visualizer Pro 1.6</a> and <a href="https://en.wikipedia.org/wiki/GIMP" class="extiw" title="w:GIMP">the GIMP</a>.
Own work.
From <a href="https://en.wikipedia.org/wiki/Protein_Data_Bank" class="extiw" title="w:Protein Data Bank">PDB</a> <a rel="nofollow" class="external text" href="http://www.rcsb.org/pdb/cgi/explore.cgi?pdbId=1W0E">1W0E</a>.