Figure 2.

Effects of Hoodia spray on spontaneous ((a) and (c)) and KCl-stimulated ((b) and (d)) contractility of uterine rings from nonpregnant ((a) and (b)) and late-pregnant ((c) and (d)) animals. Experiments were performed in the presence (■) and absence (□) of propranolol. *, **, and *** indicate P < 0.05, P < 0.01, and P < 0.001, respectively.