What Defines a Stem Cell? Scientists Rethink the Answer

After several puzzling discoveries have proven that certain stem cell populations are not stem cells at all, or that some differentiated adult cells are able to revert to a stem-like state in certain situations, scientists are redefining what it means to be a stem cell. Dr. Hans Clevers, Dr. Jonathan Hoggatt, and Dr. Pamela Robey discuss tissue repair, phony treatments, and the controversy of what characterizes “stemness” in this piece by Jordana Cepelewicz of Quanta Magazine.

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