SPG,Ecto-ATP diphosphohydrolase,Ectonucleoside triphosphate diphosphohydrolase,ENTPD,ENTPD1,ATPDase,CD39,NTPDase-1,SPG64,CD 39,NTPDase1,Ecto-apyrase,Ectonucleoside triphosphate diphosphohydrolase 1,NTPDase 1,Ecto-ATP diphosphohydrolase 1,Lymphoid cell activation antigen, NTPDase-1,CD39 antigen,DKFZp686D194,DKFZp686I093,Ecto apyrase,Ecto ATP diphosphohydrolase,Ecto-ATPase 1,Ecto-ATPDase 1,ENTP1,ENTPD 1,FLJ40921,FLJ40959,Ectonucleoside triphosphate diphosphohydrolase-1 (NTPDase-1) is an integral membrane protein with an extracellular active site. Recombinant human NTPDase-1 was expressed as a protein lacking its N- and C-terminal transmembrane domains, resulting in the secretion of the soluble recombinant human NTPDase-1 ectodomain.