Breakdown of <a href="https://en.wikipedia.org/wiki/norepinephrine" class="extiw" title="en:norepinephrine">norepinephrine</a>. <i>Further information: <a href="https://en.wikipedia.org/wiki/Norepinephrine#Degradation" class="extiw" title="wikipedia:Norepinephrine">Wikipedia:Norepinephrine#Degradation</a>.</i>
<p><a href="https://en.wikipedia.org/wiki/User:Mikael_H%C3%A4ggstr%C3%B6m" class="extiw" title="en:User:Mikael Häggström">Mikael Häggström</a>.
</p><p>When using this image in external works, it may be cited as:
</p>
<ul><li><cite style="font-style:normal">Häggström, Mikael (2014). "<a class="external text" href="https://en.wikiversity.org/wiki/WikiJournal_of_Medicine/Medical_gallery_of_Mikael_H%C3%A4ggstr%C3%B6m_2014">Medical gallery of Mikael Häggström 2014</a>". <i>WikiJournal of Medicine</i> <b>1</b> (2). <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.15347/wjm/2014.008">10.15347/wjm/2014.008</a>. <a href="https://en.wikipedia.org/wiki/International_Standard_Serial_Number" class="extiw" title="en:International Standard Serial Number">ISSN</a> <a rel="nofollow" class="external text" href="https://www.worldcat.org/issn/2002-4436">2002-4436</a>.</cite> <a rel="nofollow" class="external text" href="https://creativecommons.org/publicdomain/zero/1.0/deed.en">Public Domain</a>.</li></ul><p>or
</p>
<ul><li><i>By Mikael Häggström, used with permission.</i></li></ul>
<p><span class="int-own-work" lang="en">Own work</span> using Inkscape
</p>
<ul><li>Reference:  <cite class="book" style="font-style:normal">Rod Flower; Humphrey P. Rang; Maureen M. Dale; Ritter, James M. (2007)      <i> Rang &amp; Dale's pharmacology</i>, <a href="https://en.wikipedia.org/wiki/en:Edinburgh" class="extiw" title="w:en:Edinburgh"><span title="capital city of Scotland, UK">Edinburgh</span></a>:  Churchill Livingstone  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/0-443-06911-5" title="Special:BookSources/0-443-06911-5">0-443-06911-5</a>. </small></cite></li></ul>