Effect of ligand on the interaction of Rev-erbα LBD with labeled peptides. Normalized anisotropy profiles of the titration by Rev-erbα LBD of (A) NCoRID1B-2-fluorescein in the absence of ligand (pink) and in the presence of 20 µM SGN (blue), 20 µM SD7 (green), and 5 µM heme (orange); (B) NCoRID1B-2-fluorescein in the absence of ligand (pink) and in the presence of 100 µM SGN (blue), 100 µM SD7 (green), and 10 µM heme (orange); (C) SMRT ID1B-2-rhodamine in the absence of ligand (pink) and in the presence of 100 µM SGN (blue), 100 µM SD7 (green), and 10 µM heme (orange); (D) NCor5-Atto647N in the absence of ligand (pink) and in the presence of 100 µM SGN (blue), 100 µM SD7 (green), and 10 µM heme (orange).