RecruitingBiological interventionImproving Islet Transplantation Outcomes With Gastrin for Type I DiabetesThis clinical study will evaluate the safety and effectiveness of Gastrin treatment with islet transplantation to help patients with difficult to control type 1 diabetes make insulin again and improve blood sugar control. This study involves two investigational (experimental) products not yet approved by the U.S. Food and Drug Administration (FDA) as a treatment for any disease: 1. Human allogenic islet cells (islet cells from a deceased, unrelated human donor) 2. Gastrin-17 (Gastrin) - a hormone secreted by the gut