MR = Mineralocorticoid receptor; PR = Progesterone receptor. The relative binding affinity (%) of the main progestins discussed in this paper for the different steroid receptors is indicated.

Progesterone travels in the blood to tissues where there are progesterone receptors. It attaches to the receptors to produce actions in the body. Share on Pinterest Progesterone plays a key role ...

Ulipristal (see Figure 1 below) is another derivative of 19-norprogesterone that functions as a selective progesterone receptor modulator (SPRM) with both agonistic and antagonistic effects on the ...

In general, the more receptors you have and the greater their ... or only “PR-positive” (sensitive to progesterone) -- not both -- it may still respond to hormone treatments.