The purpose of this study is to evaluate how well LY4005130 is tolerated and what side effects may occur in healthy participants. The study drug will be administered either subcutaneously (SC) (under the skin) or intravenously (IV) (into a vein in the arm). Blood tests will be performed to check how much LY4005130 gets into the bloodstream and how long it takes the body to eliminate it. Part A for the single-ascending doses (SAD) of the study will last about 12 weeks with 9 visits. Part B for the multiple-ascending doses (MAD) of the study will either last about 16 weeks with 13 visits or 26 weeks with 14 visits not including screening.