– Ectonucleotide pyrophosphatase/phosphodiesterase (ENPP)-1 is a membrane-bound protein that catalyzes the hydrolysis of extracellular nucleoside triphosphates to monophosphate and extracellular inorganic pyrophosphate (ePPi). Mechanical stimulation regulates ENPP-1 expression. ENPP1 Protein, Human, Recombinant (C-His) is expressed in HEK293 mammalian cells with C-His tag. The predicted molecular weight is 96.5 kDa and the accession number is P22413.