A First In Human (FIH) Study to Learn if Different Doses of ALN-ANG3 Are Safe and Well Tolerated in Healthy Adults

This study is researching an experimental drug called ALN-ANG3 (called \"study drug\"). The study is focused on healthy participants. The aim of the study is to see how safe and tolerable the study drug is in healthy adults. The study is looking at several other research questions, including: * What side effects may happen from taking the study drug * How much study drug is in the blood at different times * Whether the body makes antibodies against the study drug (which could make the drug less effective or could lead to side effects)