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RAINIER is a clinical research study for adults who have been diagnosed with IgA Nephropathy (IgAN) by kidney biopsy. This study is evaluating the safety and effectiveness of an investigational medicine and how it might work to preserve kidney function. Other study requirements will apply. Study participation is a little longer than 2 years. You will attend in-person study visits to receive the study treatment and participate in study assessments every 4 weeks. Study participants can expect the following: