Michael Purdy Senior Medical Sciences Writer purdym@wustl.edu (314) 286-0122 Scientists at Washington University School of Medicine in St. Louis working with diabetic mice have examined in unprecedented detail the immune cells long thought to be responsible for type 1 diabetes. Researchers were able to examine the immune cells from isolated insulin-making structures in the pancreas known as the islets of Langerhans. They caught the immune cells, known as dendritic cells, "red-handed" carrying insulin and fragments of insulin-producing cells known as beta cells. This can be the first step toward starting a misdirected immune system attack that destroys the beta cells,...