(A) Scatchard analysis of tritiated aldosterone binding in extracts prepared from pRShMR-transfected COS cells (B and C) Competition of unlabeled steroids for binding with 5 nM [3H] aldosterone in transfected COS cell extracts Abbreviations: Aldo, aldosterone, Doc, deoxycorticosterone; Dex, dexamethasone; Spiro, spironolactone; E2, 17β-estradiol; CS, corticosterone; HC, hydrocortisone; and Prog, progesterone. Figure adapted from Arriza et al (28).