however, the beta cells produced by the pancreas in the past and present in a person with type 1 are attacked and destroyed by the immune-system's t-cells, never allowing those particular insulin-producing cells to come back---just like brain cells.
the key of course to all of this is understanding that there is nothing wrong (per say) with a type 1's pancreas!
the problem is the immune-system. it is essentially hyper-activated (the definition of autoimmunity) and attacking a specific organ/system within the body. For example, with MS, the immune system attacks the myelin sheath of the spinal cord/nervous system leaving nerve fibers exposed and destructed, leading to degenerative function associated with MS sufferers.
i believe that immunologists like dr. denise faustman are the key to our cure. let's hope they can get to the bottom of this very destructive mode the immune-system gets in so that we can all live more wholly.
there are excellent books on autoimmunity out there, such as The Autoimmune Epidemic and Living Well with Autoimmune Disease.