The non-DNA-binding heterooligomeric form of mammalian steroid hormone receptors contains a hsp90-bound 59-kilodalton protein.

Untransformed cytosol receptors for progesterone (PR), androgen (AR), estrogen (ER), and glucocorticosteroid (GR) in rabbit tissues contain a 59-kDa protein (p59) (Tai, P.K.K.