Figure 1.

Concentration–response curves of (A) methacholine- and (B) KCl-induced contractions of HTSM strips, pretreated with vehicle (control) or collagen I (50 µg·mL⁻¹) in the absence or presence of PDGF (10 ng·mL⁻¹) for 4 days. Data represent means ± SEM of three to seven experiments performed in duplicate.