Electrophoresis. Filling 1D gel wells with proteins.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/57519914@N00">Jean-Etienne Poirrier</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/57519914@N00/840487764/">Filling 1D gel wells with proteins mixture</a>