HUVECs were infected with Lentiviral particles expressing GFP-Tagged neuromodulin @ passage 1. Puromycin resistant PM-GFP-HUVECs were selected and shipped in frozen vials (cells are provided @ passage 3). Endothelial Growth Medium is recommended for cell culture and these cells have a minimum of 18 population doubling levels when cultured following the protocols described below).