Single layer epithelium. Dark field observation in transmitted light.
<a href="//commons.wikimedia.org/w/index.php?title=User:MKA.Science&amp;action=edit&amp;redlink=1" class="new" title="User:MKA.Science (page does not exist)">Kirill Mikhaylyuk</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>