The human estrogen receptor hormone binding domain dimerizes independently of ligand activation Salomonsson, M.; Häggblad, J.; O'Malley, B.W.; Sitbon, G.M. Journal of Steroid Biochemistry and Molecular Biology 48(5-6): 447-452 1994 0960-0760 10.1016/0960-0760(94)90192-9 https://eurekamag.com/research/009/584/009584345.php