https://pdb101.rcsb.org/learn/paper-...-activity-page
I had already posted this here, as antidote to too much cake,
https://www.papermodelers.com/forum/715856-post657.html
but thought it deserved its own posting.
The site will teach you about protein molecule structure and show you how to make your onw insulin.
Here is detailed discussion of protein structure if you want more information about proteins
https://www.youtube.com/watch?v=EweuU2fEgjw