<p>Schematic diagram of antiparallel <a href="https://en.wikipedia.org/wiki/hydrogen_bond" class="extiw" title="w:hydrogen bond">hydrogen bonding</a> in the <a href="https://en.wikipedia.org/wiki/beta_sheet" class="extiw" title="w:beta sheet">beta sheet</a> <a href="https://en.wikipedia.org/wiki/protein" class="extiw" title="w:protein">protein</a> <a href="https://en.wikipedia.org/wiki/structural_motif" class="extiw" title="w:structural motif">structural motif</a>. Created using <a rel="nofollow" class="external text" href="http://www.acdlabs.com/download/chemsk.html">ACD/ChemSketch 10.0</a> and <a href="https://en.wikipedia.org/wiki/Inkscape" class="extiw" title="w:Inkscape">Inkscape</a>.
</p>
<dl><dt>Legend</dt></dl><div class="legend" style="direction:ltr;line-height:23px;"><div class="legend-content" style="display:inline-block;vertical-align:top;box-sizing:border-box;width:34px;height:23px;overflow:hidden;font-size:15px;border:thin solid #333;background:red;color:#202122;text-align:center;"> </div> <a href="https://en.wikipedia.org/wiki/Oxygen" class="extiw" title="w:Oxygen">Oxygen</a> atoms</div>
<div class="legend" style="direction:ltr;line-height:23px;"><div class="legend-content" style="display:inline-block;vertical-align:top;box-sizing:border-box;width:34px;height:23px;overflow:hidden;font-size:15px;border:thin solid #333;background:blue;color:#202122;text-align:center;"> </div> <a href="https://en.wikipedia.org/wiki/Nitrogen" class="extiw" title="w:Nitrogen">Nitrogen</a> atoms</div>
<a href="//commons.wikimedia.org/wiki/User:Fvasconcellos" title="User:Fvasconcellos">Fvasconcellos</a>
Own work.<br>Created by uploader upon request by <a href="//commons.wikimedia.org/wiki/User:Opabinia_regalis" title="User:Opabinia regalis">Opabinia regalis</a>.