RecruitingPhase 1Biological interventionA Phase 1b Open-label Study to Evaluate Safety of Plamotamab in Participants With Rheumatoid ArthritisThe purpose of this study is to determine the safety and tolerability of plamotamab in patients with rheumatoid arthritis. Participants will be given XmAb13676 subcutaneously (SC) by injection under the skin.