Fig. 2From: The main rhinovirus respiratory tract adhesion site (ICAM-1) is upregulated in smokers and patients with chronic airflow limitation (CAL)Quantification of ICAM-1-expressing cells in cross-sectional study (a) large airway epithelium. b small airway epithelium. c lung alveolar epithelial cells. Abbreviations: NC, normal control; CAL, chronic airflow limitation; ICAM-1, intercellular adhesion molecule-1; NLFS, normal lung-function smokerBack to article page