Figure 4.

Pharmacological characterization of AM receptors in pregnant rat uterine artery. Inhibitory effect of two kinds of AM receptor antagonists, 10 μm AM_22-52 (A) and 10 μm CGRP_8-37 (B) on AM-induced relaxation of uterine arterial rings, precontracted by ED₇₀ concentration of norepinephrine. Data represent mean ± sem. *, P ≤ 0.05 (repeated measures ANOVA followed by Bonferroni posttest); **, P ≤ 0.01. F_(5,18) = 26.57 (A), F_(5,12) = 22.61 (B); n values (artery segments from separate animals) presented in parentheses.