however , the original microsomal estrogen-binding sites are not simply cytosol receptor contaminants , as evidenced by the observations that the microsomal binding site concentration is independent of the volume of tissue homogenate ( indicating that a trapping phenomenon is not operative ) and that nonextracted microsomes are not potential acceptor sites for cytosol estradiol-receptor complexes .
C0034804
estrogen-binding sites
C0034803
sites