<qa>  What is the first step in the study?Patients from 12 to 35 years old with type I diabetes mellitus proved by anti-pancreatic beta cell antibodies and recently diagnosed less than 6 weeks will be included in this study. First, bone marrow derived adult mesenchymal stem cells are collected from a first degree relative and cultured. After that, the patient receive 4 intravenous infusions 1 week apart followed by 4 infusion 4 months apart. 