Human homologs of the putative G protein-coupled membrane progestin receptors (mPRalpha, beta, and gamma) localize to the endoplasmic reticulum and are not activated by progesterone.
Mol Endocrinol. 2006 Dec;20(12):3146-64. doi: 10.1210/me.2006-0129. Epub 2006 Sep 7.
Mol Endocrinol. 2006.
PMID: 16959873