Nicotinamide adenine dinucleotide phosphate (NADP) and NADPH form redox pairs. NADP/NADPH is a coenzyme that supports redox reactions, particularly anaerobic reactions such as lipid and nucleic acid synthesis, through electron transport. NADP/NADPH is a coenzyme that couples various cytochrome P450 systems and oxidase/reductase reaction systems, such as the thioredoxin reductase/thioredoxin system.