IMMORTAL CELLS. “Indeed, it is well-known that primitive organisms (e.g. bacteria, algae, protozoids, …) are in a sense immortal. That is, when they reproduce (by mere splitting of cells) there is no difference between “parent” and “offspring”: both splitted cells continue to survive, and undergo further splits, without any apparent aging or senescence.”
http://pespmc1.vub.ac.be/evolage.html