the concentrations of cytosol ( erc ) , nuclear ( ern ) , and total ( erc+n ) estrogen receptors were determined by enzyme immunoassay using monoclonal antibody , in normal endometrium freshly obtained from 13 cases , and were compared with those determined by a conventional ligand binding assay on lh-20 ( lh-20 assay ) .
C0034804
estrogen
C1517880
ligand binding