Fig. 4From: Effect of sub-chronic exposure to cigarette smoke, electronic cigarette and waterpipe on human lung epithelial barrier functionLevels of E-cadherin (CDH1) mRNA transcript quantified by RT-qPCR from HBECs exposed to EC, CS, and control air (Air) (a) or TW and control air (Air) (b). Nicotine concentration in e-liquid is 0% or 1.2%. Vertical bars are mean (±SD). Significant changes in relation to control air (*). Donors: donor 1, filled circles (•); donor 2, empty squares (□); donor 3, empty circles (ο)Back to article page