Just before the invention of HeLa cells, experts were being not able to establish tissue cultures with any reliability or security. A lot more than 6 decades later on, this cell line is still alive and currently being used for health care analysis. See Eye on Ethics: The Immortal Cell https://www.facebook.com/NewTechFind/posts/pfbid038Piyb3z33Xinhy2xuAPJ7opoWDC46vFrRd7C6AZvwPNESTLGMFViiDEgJB3CvWnrl