Stem Cells are biological cells found in all multicellular organisms, that can divide and differentiate into diverse specialized cell types and can self-renew to produce more stem cells. In mammals, there are two broad types of stem cells: embryonic stem cells and adult stem cells, which are found in various tissues. In adult organisms, stem cells and progenitor cells act as a repair system for the body, replenishing adult tissues.
If anyone wants to know about stem cell treatment here are a few useful links you can follow up.
I'm not comfortable writing about the treatment Tova may or may not have had as it is so controversial and other things. I'm not interested in being involved in this political debate publicly.
So, here are some links for anyone wanting to know more.