Prior to the discovery of HeLa cells, researchers were unable to establish tissue cultures with any reliability or security. In excess of 6 decades afterwards, this cell line remains to be alive and staying used for clinical study. See Eye on Ethics: The Immortal Cell Line of Henrietta Lacks to https://www.facebook.com/NewTechFind/posts/pfbid0d8VStcYignkfVz6MCZSKLaerVPpxVNKDb8CThGkvBTun4BMDH6o6PiDFY8YUrpQVl