Cysteinyl leukotriene type 1 receptor mRNA and protein-positive cells in bronchial biopsies. Graphs of counts for cysteinyl leukotriene type 1 (cysLT1) receptor mRNA and protein-positive cells in bronchial biopsies of nonsmoker control (normal), stable asthma, and exacerbated asthma (exac) groups. Data expressed as the number of positive cells per mm2 of subepithelium. Dots show individual counts and horizontal bars show median values (Mann-Whitney U test). Reprinted with permission from Zhu and colleagues .