This study is about trying a new medicine, **WVE-N531**, for boys with **Duchenne Muscular Dystrophy (DMD)**. DMD is a condition that makes muscles weak over time. The study checks if the medicine is safe and how it affects the body. The medicine is given through an **IV (intravenous)**, which means it goes directly into the blood through a vein.
**Key Points:**
- **Participation Length:** The study has different parts, and Part C will last several months with muscle checks at the start and after 24 weeks.
- **Visits and Tests:** Participants will have regular check-ups and undergo muscle biopsies, which involve taking a small piece of muscle for testing.
- **Eligibility:** Participants must have a specific genetic change in their DMD gene and be on stable medication for at least 6 months.
New patients can join Part C, where they will be closely watched for safety and changes in muscle protein levels called **dystrophin**. Joining the study means regular hospital visits and tests, but it could help find new ways to treat DMD. Always talk to your doctor before deciding to join a study.
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