Rabbit Anti-Human ENTPD1 polyclonal antibody for WB, ICC, IHC. Ectonucleoside triphosphate diphosphohydrolase 1 (NTPDase 1), also known as, Ecto-ATP diphosphohydrolase 1 (Ecto-ATPDase 1 or Ecto-ATPase 1) or Ecto-apyrase or Lymphoid cell activation antigen or CD39, and encoded by the gene name(s), ENTPD1 or CD39, uses an alternate 5 exon that results in a distinct 5 UTR and causes translation initiation at an alternate start codon, compared to variant 1. Isoform 2 has a longer and distinct N-terminus, compared to Isoform 1. ENTPD1 is localized to the membrane and is expressed primarily on activated lymphoid cells. ENTPD1 is also expressed in endothelial tissues. Isoform 1 and isoform 3 are present in both placenta and umbilical vein, whereas isoform 2 is present in placenta only.