Fig. 8.
Two different dimer surfaces of nuclear receptors. Surfaces A and B are on the opposite sides of the CAR molecule. Three loops shaped with half circles comprise surface A for homodimerization and may also for heterodimerization of two different nuclear receptors, such as CAR and VDR. Surface B is well established as heterodimerizing with RXR. ERα was suggested to form its homodimer through surface B.