NADPH

Nicotinamide adenine dinucleotide phosphate (NADP), like its homolog nicotinamide adenine dinucleotide (NAD), is a biological carrier of reducing equivalents, i.e., it can accept and deliver electrons. In that sense, it functions generally as a coenzyme. NADP differs from NAD by the presence of a phosphate group at the C-2' position of the adenosyl moiety. The molecule exists in cells in reduced (NADPH) and oxidized forms reflecting the redox state of the cell.