The investigators hypothesize that differences in the PK characteristics of insulin analogs will lead to differences in glycemic outcomes when delivered by the insulin-only configuration of the bionic pancreas. Specifically, the investigators predict that insulin analogs that have faster absorption (numerically lower Tmax and/or T½max) and insulin analogs that have faster clearance (numerically lower terminal half-life) will result in lower mean glucose and/or a lower percentage of time in the hypoglycemic range.