This study is testing a new medicine called **LY4006896** and is for both healthy people and those with Parkinson's disease, which is a brain disorder that affects movement. The study compares the effects of LY4006896 with a placebo (which looks like the real medicine but doesn't have any active ingredients) to see if it's safe and how it works in the body.

People with Parkinson's can be in the study for up to **78 weeks** and might get 4 doses of the medicine. Healthy participants could be in the study for about **53 weeks** and receive 1 dose. To join, participants need to have a certain **body weight** and be between **30 to 85 years old**. They should not have serious health problems or allergies to the study medicine.

• The study lasts up to **78 weeks** for Parkinson's patients and **53 weeks** for healthy people.
• Participants must meet specific health criteria and age limits.
• Risks include allergic reactions or health issues from the medicine.