these findings led us to administer such biologically active substances as uterine rna , decidual high molecular rna , human chorionic rna , rat placental rna ( l15 ) and early pregnant rat uterine rna ( l4 ) separately in the uterine cavity of delayed implantation rats to determine whether any one or more of these rnas had a nidation promoting effect just like estrogen .
C0032043
placental
C0227844
uterine cavity