Increase in prostaglandin H synthase 2, but not prostaglandin F2alpha synthase mRNA in intrauterine tissues during betamethasone-induced premature labor and spontaneous term labor in sheep - Wu,W.X.; Ma,X.H.; Yoshizato,T.; Shinozuka,N.; Nathanielsz,P.W. (J Soc Gynecol Investig, 2001)