Stem cells are special kinds of cells in our body that can become any other type of cell. They have huge potential for medicine, and trials are currently under way using stem cells to replace damaged cells in diseases like Parkinson’s.
One way to get stem cells is from human embryos, but this has ethical concerns and practical limitations. Another way is to turn adult cells from the skin or elsewhere into what are called “induced pluripotent stem cells” (iPS cells).
However, these cells sometimes carry a “memory” of the kind of cell they used to be, which can make them less predictable or efficient when we try to turn them into other types of cells.
