 Negative control animals are
further defined by</p><ul><li><p>either containing a word from a set of words, to
automatically distinguish it as a negative control:</p><ul><li><p>['placebo', 'untreated', 'sham']</p></li>
</ul></li>
<li><p>or containing a combination of a word  from of two lists:</p><ol><li><p>['negative', 'saline', 'peg', 'vehicle', 'citrate', 'dextrose', 'water', 'air']</p></li>
<li><p>['item', 'control', 'article']</p></li>
</ol></li>
</ul><p>Animals are in all cases excluded (i.e. 