urine excretion of immunoreactive prostaglandin e2 and 6-keto-prostaglandin1 alpha decreased significantly in the experiment without pretreatment with indomethacin , whereas indomethacin pretreatment reduced the basal excretion of prostanoids and abolished the progesterone-induced decrease in their excretion .
C0012472
prostaglandin e2
C0033554
prostanoids