I have a lot of the microbe plushies from Giant Microbes and today they announced a beta cell:
http://www.giantmicrobes.com/us/products/betacell.html
I love it!
That is so cute! It reminds me of the pancreas plushie I saw a little while back.
Now, all we need are beta cell and pancreas punching bags (the plushies are too cute to put our frustration on).