estradiol and the numbers of unfilled estrogen binding sites were greatest at estrus in both the cytoplasm ( .33 and 7.5 pmole/mg of dna , respectively ) and nuclei ( .58 and 3.9 pmoles/mg dna ) and declined to low values by days 12 and 15 of the estrous cycle .
C0034804
estrogen binding sites
C0010834
cytoplasm