What's the difference between PromoCell HUVECs and HUV-EC-C from ATCC?

PromoCell HUVECs are freshly isolated from umbilical veins. They are cryopreserved at the end of primary culture. After revival; they can be propagated for at least 15 doublings and will senesce eventually. HUV-EC-C from ATCC is a hypodiploid human cell line of endothelial origin (umbilical vein). The modal chromosome number is 45 occurring in 72% of cells counted. The rate of polyploid cells is 15.8%. The cells have a life expectancy of 50 to 60 population doublings. This indicates that the cells are no longer "normal cells" but have undergone some degree of transformation.