CD39, the vascular ecto-nucleoside triphosphate diphosphohydrolase-1, is a crucial modulator of hepatic ischemia/reperfusion injury: Simon C Robson, Department of Medicine, Gastroenterology, Harvard Medical School, Boston, MA; Sun Xiaofeng, Harvard Medical School, Boston, MA; Olaf Guckelberger, Charité, Campus Virchow Clinic, Department of Visceral and Transplantation Surgery, Berlin Germany; Keiichi Enjyoji, Harvard Medical School, Boston, MA; Masato Imai, Asahikawa Medical Coll, 2nd Dept of Surg, Asahikawa Japan