MRP4 mRNA levels in in vitro cultured DCs. MRP4 mRNA levels were determined in MUTZ3 progenitors, in differentiated, immature MUTZ3-DCs (DC) and MUTZ3-LCs (LC), in monocytes (mono) and in immature MoDC (MoDC) by Lightcycler RT-PCR. Depicted are the mRNA ratios compared with mRNA values for β-actin (n = 3; mean ± SD).