CYP11B1 and cervical cancer: Expression of PGRMC1, cyt b5, and CYP11B1 (a mitochondrial CYP involved in the synthesis of glucocorticoids and mineralocorticoids) in cervical cancer cells (HeLa) showed PGRMC1’s intracellular location consistent with that of cyt b5, but not of CYP11B1, suggesting that PGRMC1 is associated with the ER membrane [130].