There are many types of stem cells to use in different conditions including embryonic stem cells, mesenchymal stem cells, hematopoietic stem cells, neural stem cells, as well as many other sources.

However, the most widely tested type in SCI, that has shown clinical benefit, is the mesenchymal origin. And even within the mesenchymal stem cell line, there are multiple sources including the bone marrow, the umbilical cord, and the adipose/fat tissue; with the cell lines with proven clinical benefits on patients with SCI only being the bone marrow and umbilical cord samples (7, 9).