CD4⁺ T cells in rituximab-infused RMs and controls. Changes in CD4⁺ T cells in blood (A, percentages; B, absolute counts), lymph nodes (C), and intestine (D) in rituximab-infused RMs with complete CD20 depletion (■), incomplete tissue CD20 depletion (▾), and in control RMs (●). Plots represent the average expression for the animals in each study group. Vertical lines represent the SEM.