Enantiómeros L y D de la Alanina
<a href="//commons.wikimedia.org/wiki/User:Alejandro_Porto" title="User:Alejandro Porto">Alejandro Porto</a>
CC BY-SA 3.0
Derivada de <a href="//commons.wikimedia.org/wiki/File:L-alanine-3D-balls.png" title="File:L-alanine-3D-balls.png">File:L-alanine-3D-balls.png</a> y de <a href="//commons.wikimedia.org/wiki/File:D-alanine-3D-balls.png" title="File:D-alanine-3D-balls.png">File:D-alanine-3D-balls.png</a> de <a href="//commons.wikimedia.org/wiki/User:Benjah-bmm27" title="User:Benjah-bmm27">Benjah-bmm27</a>.