this is evidence that functional luteolysis in human ovaries ( 1 ) is pre-programmed to occur at the cellular level , ( 2 ) is initiated automatically at the time of ovulation and ( 3 ) is reversed at the time of cl 'rescue ' in early pregnancy by the direct action of trophoblastic hcg on steroidogenic luteal cells .
C0010092
cl
C0024156
luteal