because of methodological problems associated with the measurement in biological fluids of both prostaglandin e2 ( pge2 ) and its unstable principal circulating metabolite 13,14-dihydro-15-keto-pge2 ( pgem ) , there is little reliable information on these prostaglandins in human pregnancy and parturition .
C0012472
prostaglandin e2
C0033554
prostaglandins