Container element for footnotes that appear at end of the document.
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The following, in order:
<abstract>, <ack>, <app>, <back>, <bio>, <boxed-text>, <front>, <notes>, <sec>, <table-wrap-foot>, <title-group>, <trans-abstract>
...
<back>
<ack>
<p>We are grateful to Uri Alon, Harley McAdams, Lee Kroos,
Patrick Piggot, and Patrick Stragier for critical comments
of the manuscript. ...</p>
...
</ack>
<fn-group>
<fn id="n1" fn-type="conflict">
<p><bold>Conflicts of interest.</bold> The
authors have declared that no conflicts
of interest exist.</p>
</fn>
<fn id="n2" fn-type="con">
<p><bold>Author contributions.</bold> PE, MF,
STJ, EMC, DZR, TS, JSL, and RL conceived and designed
the experiments. PE, MF, DZR, STW, CF, and KH performed
the experiments. PE, MF, STJ, EMC, DZR, and JSL
analyzed the data. PE, MF, STJ, EMC, DZR, and JSL
contributed reagents/materials/analysis tools. PE, MF, STJ,
EMC, JSL, and RL wrote the paper.</p>
</fn>
</fn-group>
...
</back>
...
<article>...
<back>...
<ref-list>...
</ref-list>
<fn-group>
<fn>
<p>Competing interests: None declared.</p>
</fn>
</fn-group>
</back>
</article>
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