Rat Endothelial (Trans-Diff.) Stem Cells (Plated cells are also available). 120 Population doublings. Cells are only guaranteed with purchase of Creative Bioarray Media and Creative Bioarray Extra Cellular Matrix for appropriate cell culture, for 30 days from the date of shipment. Product Link:http://www.creative-bioarray.com/QualiCell-reg-Rat-Endothelial-Trans-Differentiated-Stem-Cells-XLC529-CSC-C00402-item-2958.htm