Comparison of DC and monocytes for presentation of peptide to the NG-1 line. NG-1 cells (4.0 × 10⁴) were incubated with indicated numbers of (A) sorted DC, (B) sorted monocytes, (C) HLA-DRβ1*0101 transfected L cells and 20 μg/mL of b3a2 (▴) or b2a2 (▾) peptide or equivalent volume of solvent (□). Results represent the mean of triplicate wells ± SEM.