I found it interesting that transforming blood directly to neural stem cells dramatically slowed rejuvenation. I wonder if you could transform blood into itself? Is something like that even possible? If you could, then maybe it would still kick-start the rejuvenation process. Maybe if you could do that generically for all cell types in a living body, you could very slowly rejuvenate the entire body. Of course, the rejuvenation process may necessarily require a stem-cell stage.

I think this is the original paper: https://onlinelibrary.wiley.com/doi/10.1111/acel.70751