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<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>
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<article>
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<back>
<ref-list>
<ref>
<element-citation>
<person-group>
...
</person-group>
<source>Nature (London)</source>
<year>2001</year>
<volume>411</volume>
<fpage>498</fpage>
<lpage>501</lpage>
<pub-id pub-id-type="pmid">11373685</pub-id>
</element-citation>
</ref>
</ref-list>
<fn-group>
<fn>
<p>This paper was submitted directly (Track II) to the PNAS
office.</p>
</fn>
<fn id="FN153">
<p>&#x00A7; Barta, A., Dorner, S., Polacek, N., Berg, J. M.,
Lorsch, J. R., Nissen, P., Hansen, J., Muth, G. W. &#x0026; Ban, N.
(2000) <italic>Science</italic> <bold>291</bold>, 203a (abstr.).</p>
</fn>
</fn-group>
</back>
</article>