(a) protein domains of nuclear (nPR-A, nPR-B), mitochondrial (PR-M), membrane (mPR) and membrane-associated progesterone receptors (MAPR); (b) localization of progesterone receptors in the cell: nPR-A and nPR-B are localized in the nucleus, PGRMC1 — in the cell membrane, endoplasmic reticulum, the Golgi apparatus, in the cytoplasm, PR-M — in mitochondria, other membrane receptors and MAPR — in the cell membrane. Here: TM — transmembrane domain in PGRMC1 and PGRMC2; SP — signal peptide in neudesin and neuferricin; GPR30 — G-protein-coupled receptor