Adhesion of AS283 lymphoma cells to endothelial cells activated with Tat-MBP. AS283 lymphoma cell adhesion was tested on EC activated with different concentrations of Tat-MBP. EC were treated with medium alone (control), Tat-MBP (20 to 200 ng/mL), or equimolar concentration of MBP. EC were activated for 4 hours, and adhesion of AS283 lymphoma cells was evaluated after 30 minutes. Results show attached cells as a percentage of total added cells. Columns, mean of three replicates and representative of 1 of 3 experiments; bars, SD. *P < .01 compared with control.