Sl Selective IgM Deficiency : A Case Study

numbers of IgM-bearing lymphocytes. Normal amounts of cells with cytoplasmic IgM were induced by in vitro addition of pekeweed mitogen, and no inhibitory cells or inhibitory factors fer in vitro production of IgM were demonstrated in his blood. These results suggest that some defects similar to those in patients with selective IgA deficiency may play a role in the development of selective IgM deficiency.