pDCs and mDCs express different sets of transcriptional factors. Expression profiles of the indicated transcriptional factor genes in the resting B cells, pDCs, monocytes, and mDCs were analyzed by microarray (A) and real-time quantitative PCR (B). Results of the gene expression profiles (A) are shown as relative hybridization intensity levels in the microarray analysis. IRF indicates IFN regulatory factor; C/EBP, CCAAT/enhancer-binding protein; ICSBP, IFN consensus sequence-binding protein.