ChQ relaxes KCl- and PGF2α-induced contraction of myometrial strips from d 18 pregnant mice. A–C) Force response to 40 mM KCl alone (A), relaxation caused by 1 mM ChQ (B), and summarized results (C) (means ± sem; n = 5 for each group; KCl alone vs. KCl + ChQ, unpaired Student’s t test). D–F) Force response to 5 µM PGF2α alone (D), relaxation caused by 1 mM ChQ (E), and summarized results (F) (means ± sem; n = 5 for each group; PGF2α alone vs. PGF2α + ChQ, unpaired Student’s t test). ****P < 0.0001.