ViaCyte is developing cell therapies to replace lost pancreatic beta cells for people with type 1 diabetes (T1D). The therapies are derived from human embryonic stem cells, which are partially matured into becoming pancreatic tissues (the type destroyed in T1D). The cells are inserted into a small pouch that is transplanted under the patient’s skin. The transplanted cells will develop into fully matured beta cells that secrete the hormone insulin, which is needed to keep blood sugar levels at a healthy level. This trial is testing ViaCyte's product candidate called VC-01. This product encapsulates the cells and protects them from the patient’s immune system.