urine of pregnant women, is less costly, and has a longer half-life than lh. role in phosphorylation phosphorylation is a biochemical process that involves the addition of phosphate to an organic compound. steroidogenesis entails processes by which cholesterol is converted to biologically active steroid hormones. recent study shows that lh via a pka signaling pathway regulates the phosphorylation and localization of drp1 within mitochondria of the steroidogenic cells of the ovary.