“The rate of progesterone secretion by the trophoblastic tissue was 47.5 +/- … (control) at 450 micrograms low density lipoprotein/mL. The rates of progesterone production and cAMP accumulation …, by 10(-5) M terbutaline , and the terbutaline effect was blocked by the …-1-naphthalenesulfonamide (W-7) or 50 microM trifluoperazine.”