Left panels: low dose of PLL (25 μg in 0.1 ml); receptor location, upper lobe of right lung; rat body weight, 375 g. Right panels: high dose of PLL (50 μg in 0.1 ml); receptor location, middle lobe of right lung; rat body weight, 410 g. A–E, baseline activities at 10 min before (A), and 10 min (B), 30 min (C), 60 min (D) and 120 min (E) after PLL instillation. AP, action potential; Pt, tracheal pressure; BP, arterial blood pressure.