MIP-1β and RANTES levels (mean± SD) in CD4⁺ T cells and AECs after CMV-antigen stimulation at 3 days for each donor. Samples 1 through 8 demonstrate ELISA results from individual donors. Sample 9 represents a negative control from resting-state endothelial cells alone. Sample 10 is an additional control that shows results from endothelial cells cocultured with CD4⁺ T cells and no viral antigen stimulation. (A) MIP-1β. (B) RANTES.