623
How about the digestive system?
(lemmy.nz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
is the ok symbol 👌 a hole?
what about membranes, pores?
The ok symbol is rather temporary but topologically that would count. I wouldn't count pores or membranes here (I mean by my arbitrary definition).