Effect of camostat on maximal basal PD. A, B, Representative basal PD tracing of subjects treated with camostat 1.6 mg (A) and placebo (B). Predose and 2-h postdose tracings are shown for the same nostril and the same subject on the left and right sides of A and B, respectively. Maximal basal PD is designated with the gray bar. C, D, Maximal basal PD for each individual subject (●) and the mean of all subjects (○) treated with camostat 1.6 mg (C) and placebo (D). ***P < .005. Data are presented as mean ± SEM. AT = anterior tip of the inferior turbinate; PD = potential difference.