Molecules involved in the adhesion of DC to resting (A) and TNF-activated EC (B). ⁵¹Cr-labeled DC were preincubated for 20 minutes at room temperature with the indicated MoAb; thereafter DC were coincubated with the EC monolayers for 1 hour at 37°C. Results are expressed as percent of adherent cells, mean ± SEM of three replicates. **Statistically significant at P < .01 versus medium control.