Over recent years, therapeutic cloning has progressed enormously. As early as in 2000, it was proved that this technique acted as a cellular time machine, at least for several mammalian species. Cells were turned into immortal as aging of cells was reversed. Nonetheless, this process has only the capability to act on single cells and to reach higher levels it must be made possible to proliferate them to enhance its effectiveness. If ever this becomes a practicable phenomenon for human cells such as immune cells, blood vessels could be rejuvenated making them more resistible to diseases.