Impaired basal expression of transcription factors associated with Th1 and Th2 phenotype in unstimulated UCB. Th1 (STAT4 and t-bet) and Th2 (c-maf) associated transcription factors are decreased in expression in UCB at 0 hour. All 3 genes met the criteria for inclusion as described in “Materials and methods.” Data are shown here as the raw signal obtained from the Affymetrix HGU133A&B microarray. Fold changes between UCB and AB are indicated (FC).