the 150,000 x g supernatant fractions of these tissues were prepared , the estrogen receptor-site concentration was measured , and the relative abilities of unlabelled estradiol , estrone , 2-hydroxyestradiol and 2-hydroxyestrone to compete with [ 3h ] estradiol for estrogen binding sites was determined .
C0034804
estrogen receptor-site
C0034803
estradiol