Activation of the progesterone receptor of rabbit uterus

Activation, Transformation, and Subunit Structure of Steroid Hormone Receptors

“…Fleischmann and Beato (70) reported that both the transformed and untransformed forms of this receptor sediment at about 4S, whereas in the study of Saffran et al (71), there was a shift from 7S to 5.5S during transformation. This held true as well for the receptor of guinea pig uterus (71).…”