You can build stem cell lines that reproduce stem cells.

You can also "go backwards" from skin stem cells to fully featured stem cells.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3584308/

>Induced pluripotent stem (iPS) cells, are a type of pluripotent stem cell derived from adult somatic cells. They have been reprogrammed through inducing genes and factors to be pluripotent. iPS cells are similar to embryonic stem (ES) cells in many aspects.