THE FLAW. “By the late l960’s it became apparent to us and others that Carrel’s claim to have cultured chick fibroblast cells for 34 years was spurious. It had to be assumed that Carrel’s chick cultures consisted of normal cells because no one has ever reported a spontaneously arising transformed chicken cell strain free of oncogenic viruses. Several reports of alleged immortal chick cell lines have appeared, but all have been associated with oncogenic viruses, chemical carcinogens or radiation.”
http://protein.bio.msu.ru/biokhimiya/contents/v62/full/62111380.html