Group Health Cooperative of Puget Sound has a good discussion of insulin . Medic Drug's Pharmacy Page has some good information about human insulin. This in-depth look at porcine insulin, which is very close to human insulin, contains many excellent images of the insulin monomer and hexamer. These images are quite large, however, so be patient. An in-depth look at insulin is available, including complete genome location, nucleotide sequences and animal models.
Bacteria produce it.
Check out the Transfer and Cloning of the Insulin Gene to find out. Don't refrigerate your insulin. That Came Out of The Cold . Working Toward a Cure . Kidney Options has information for patients with kidney disease.