Figure 4From: Constitutive overexpression of a novel 21 kDa protein by Hodgkin Lymphoma and Aggressive Non-Hodgkin LymphomasPHA stimulation of T cells. T cells exposed to PHA expressed CD30 within 24 hours, peaking at 48 hours. Expression of R23.1 and R24.1 remained at control levels even up to 7 days after PHA stimulation, indicating that activation of T cells does not induce expression of R23.1 and R24.1 antigens, unlike CD30.Back to article page