Only a dozen such cell lines had been published in academic journals, and the number shocked scientists who were afraid they would not have enough embryonic stem cells to work with.
It noted segregated prisoners were not continually supervised, the accommodation was among the poorest in the prison system and prisoners did not have enough time out of their cells.
The researchers said drugs that enhance the activity of calcineurin or NFAT could become a new treatment for type-2 diabetes, in which the beta cells do not produce enough insulin.