Fig. 5. Characteristics of cells from nasal brushings. (A) Single cell stained with Giemsa/May-Grünwald, showing cilia at apical end. (B) Immunofluorescent dual labelling of cytokeratin (green) and CFTR (red) in cells from a non-cystic fibrosis individual. (C,D) Immunofluorescent dual labelling of CFTR (C) and CD59 (D) showing the same cells, viewed with appropriate filter, from a non-cystic fibrosis individual. Results are representative data from five non-cystic fibrosis individuals. Magnification x1000.