using 5s-ca as a chemical probe for the nuclear form of the estradiol receptor , i have shown the chemical as well as physical similarity of 5s receptors prepared in vivo ( by injection of [ 3h ] estradiol and subsequent isolation from nuclear/myofibrillar extracts ) and in vitro ( by labeling of cytoplasmic extracts and subsequent chromatography on columns of dna-cellulose ) .
C0206588
nuclear
C0010834
cytoplasmic