RecruitingPhase 1Biological interventionStudy of Single Doses of SBT777101 in Subjects With Rheumatoid ArthritisThis study will test the safety and effects of SBT777101 when given as a single dose to subjects with rheumatoid arthritis. It is the first study of this treatment being done in humans. Increasing dose levels will be given after the safety at lower dose levels is shown.