the following observations were obtained : 1 ) both of the e2-dependent and e2-independent srif receptors , measured with 125i-tyr11-srif as a radiolabeled ligand , were enriched in the plasma membrane fraction of the cells , displaying a single class of binding site ( e2-dependent : kd , 32 pm , bmax , 2.3 pmol/mg protein ;
C0007603
plasma membrane
C0007634
cells