Absolute lymphocyte count (ALC) after rabbit ATG and alemtuzumab. In the refractory study (left panel), the degree and duration of lymphopenia was similar between the rabbit ATG (red) and alemtuzumab arms (blue). The baseline ALC had not been reached for either group by 6 months. In the relapsed study (right panel), the pattern of lymphopenia was similar to that observed in the alemtuzumab arm in the refractory study. The mean ± SEM is shown.