RecruitingPhase 1Biological interventionNEXUS Study: A Study to Test Single and Multiple Doses of MER511 Given to Adults With Graves' DiseaseThe purpose of this study is to evaluate how well MER511 is tolerated and what side effects may occur in adults who have Graves' disease. The study drug will be administered either intravenously (into a vein in the arm) or subcutaneously (under the skin). Blood tests will be performed to investigate how the body processes the study drug and how the study drug affects the body.