Fig. (3) Cytokines induce expression of iNOS and NO production in human fetal lung epithelial cells. (A) Immature and mature human fetal lung epithelial cells were treated with cytokines as indicated. iNOS expression in the cells was determined by Western blot. (B) Total nitrogen oxides produced by immature and mature human fetal lung epithelial cells with cytokine exposure was measured in the media (*p<0.05).