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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Summerbell, D.; Lewis, J. H.; Wolpert, L. (1973). "Positional Information in Chick Limb Morphogenesis". Nature. 244 (5417): 492–496. Bibcode:1973Natur.244..492S. doi:10.1038/244492a0. PMID 4621272. S2CID 4166243. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Dudley, A. T.; Ros, M. A.; Tabin, C. (2002). "A re-examination of proximodistal patterning during vertebrate limb development". Nature. 418 (6897): 539–544. Bibcode:2002Natur.418..539D. doi:10.1038/nature00945. PMID 12152081. S2CID 1357061. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Wolpert, Lewis (2002). "The Progress Zone Model for specifying Positional Information". The International Journal of Developmental Biology. 46 (7): 869–870. PMID 12455622 – via ijdb.ehu. <a href="http://www.ijdb.ehu.es/web/paper.php?doi=12455622&a=f" target="_blank">http://www.ijdb.ehu.es/web/paper.php?doi=12455622&a=f</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>