Of this SVG version, Roland Geider (<a href="//commons.wikimedia.org/wiki/User:Ogre" title="User:Ogre">Ogre</a>), of the original PNG version, User <a href="https://en.wikipedia.org/wiki/User:Je_at_uwo" class="extiw" title="en:User:Je at uwo">Je at uwo</a> on <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>
2007-08-23
See other versions (textbook [<a rel="nofollow" class="external free" href="https://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowTOC&amp;rid=imm.TOC&amp;depth=2">https://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowTOC&amp;rid=imm.TOC&amp;depth=2</a>)