Phase 1 &2 data. 1 is mostly safety checks, but it involves several dosing profiles (typically starting low) to get a safety profile. 2 tests dose response and

Phase 1 &2 data. 1 is mostly safety checks, but it involves several dosing profiles (typically starting low) to get a safety profile. 2 tests dose response and more detailed safety. 3 tests efficacy using the dose profile determined by phase 2.