Figure 2 Expression of iNOS on epithelial cells from children with cystic fibrosis, including children with recent or past bacterial infection (⩾10⁴ colony forming units/ml BAL fluid; n = 24), children with no infection (n = 16), and healthy children (n = 12) quantified relative to the expression of β‐actin as the housekeeping gene using TaqMan real time PCR.⁷,¹⁹ The lines bisecting the boxes are medians, the box limits represent 25th and 75th percentiles, whiskers extend to the 10th and 90th percentiles, and the black dots represent outliers.