This is an observational non-medication study. The purpose of this study is to understand the immune system in people who are at risk for developing systemic lupus erythematosus ("lupus" or "SLE"). The investigators hope to develop better ways to predict who will get lupus and possibly come up with ideas for new treatments that can prevent or treat the disease.

Participants will be asked to complete 4 annual study visits and monthly telephone contacts with the study team over the course of 3 years. Visits will include a physical exam, collection of blood and urine, and the completion of some surveys/questionnaires about your health and wellbeing. The monthly phone calls will be a brief contact to check on any changes in your health and should take no longer than 15 minutes to complete.

Compensation is available for participation.

The purpose of this study is to determine if the investigational (not FDA approved) drug VIB4920 can be an effective treatment for patients with active Lupus Nephritis (LN).

This study will compare treatment with MMF (mycophenolate mofetil), Prednisone, plus the study medication VIB4920 to treatment with MMF and Prednisone alone.

Participants will have up to 15 scheduled visits that will involve routine monitoring of disease activity, up to two kidney biopsies, and blood and urine specimen collections. Participation in this study will last approximately 1 year and 2 months. Compensation is available for participation.