Myoglobin 3D structure
<sub>→<a href="//commons.wikimedia.org/wiki/User:AzaToth" title="User:AzaToth"><span style="color:#773">Aza</span></a><a href="//commons.wikimedia.org/wiki/User_talk:AzaToth" title="User talk:AzaToth"><span style="color:#359">Toth</span></a></sub>
self made based on <a rel="nofollow" class="external text" href="https://doi.org/10.2210/pdb1MBO/pdb">PDB entry</a>