From The News Wire: Possible New Source of Beta Cell

In animals aka Mice. Who would have guessed it was in mice?

http://www.sciencedaily.com/releases/2008/11/081124174855.htm

ScienceDaily (Nov. 25, 2008) — Researchers at the Joslin Diabetes Center
have shown that insulin-producing pancreatic beta cells can form after birth or
after injury from progenitor cells within the pancreas that were not beta cells,
a finding that contradicts a widely-cited earlier study that had concluded this
is not possible....

"This means that there is a population of pancreatic cells that can be stimulated, either within the body or outside the body, to become new beta cells, the cells that are lacking in diabetes," said Susan Bonner-Weir, Ph.D., the study's lead researcher and a Senior Investigator in the Section on Islet Transplantation and Cell Biology at Joslin and Associate Professor of Medicine at Harvard Medical School."