According to a recent BBC publication (see link below), the scientists demonstrated the ability to stop the on-going destruction of insulin-producing beta cells in mice using a combination of three drugs, although they were unable to regenerate the cells. However, when they added an extra ingredient - an enzyme called Alpha 1 Antitrypsin - a significant rise in the number of beta cells was seen. The study was published in "Newscientist", not the most respectable paper out there.