Fig. 3From: The main rhinovirus respiratory tract adhesion site (ICAM-1) is upregulated in smokers and patients with chronic airflow limitation (CAL)Correlation between total epithelial cells positive for ICAM-1 with smoking history (pack years). a large airway epithelium. b small airway epithelium. c lung alveolar epithelial cells. Abbreviations: ICAM-1, intercellular adhesion molecule-1Back to article page