ScienceDaily — B cells, precursors of autoantibody-secreting cells, have emerged as promising new therapeutic targets in autoimmune diseases, including rheumatoid arthritis (RA). In particular, B cell depletion with the anti-CD20 antibody rituximab seems to work for RA patients resistant to standard disease-modifying antirheumatic drugs (DMARDs) and tumor necrosis factor a (TNFa) blockers.