Forced expression of a specific set of transcription factors can reprogram terminally differentiated cells and convert them into induced pluripotent stem cells that correspond to cells in the inner cell mass of the developing embryo. It is now recognized that the scope of the reprogramming factors extends far beyond the stem cell biology. Studies using mouse models demonstrated that the induction of the reprogramming factors promotes cellular reprogramming in vivo. Closer inspection of these mice has revealed that expression of the reprogramming factors results in unique consequences that are not seen when cells are reprogrammed ex vivo, and can provide insights into development, tissue regeneration, cancer, and aging.
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